diff --git a/src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php b/src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php
index ea4232c4ee75a..b5544070a5678 100644
--- a/src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php
+++ b/src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php
@@ -14,6 +14,7 @@
 use Psr\Log\LoggerInterface;
 use Symfony\Component\Translation\Exception\ProviderException;
 use Symfony\Component\Translation\Loader\LoaderInterface;
+use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Provider\ProviderInterface;
 use Symfony\Component\Translation\TranslatorBag;
 use Symfony\Component\Translation\TranslatorBagInterface;
@@ -60,7 +61,7 @@ public function write(TranslatorBagInterface $translatorBag): void
         }
 
         foreach ($catalogue->all() as $domain => $messages) {
-            $createdIds = $this->createAssets(array_keys($messages));
+            $createdIds = $this->createAssets(array_keys($messages), $domain);
             if ($createdIds) {
                 $this->tagsAssets($createdIds, $domain);
             }
@@ -117,7 +118,18 @@ public function read(array $domains, array $locales): TranslatorBag
                 throw new ProviderException('Unable to read the Loco response: '.$responseContent, $response);
             }
 
-            $translatorBag->addCatalogue($this->loader->load($responseContent, $locale, $domain));
+            $locoCatalogue = $this->loader->load($responseContent, $locale, $domain);
+            $catalogue = new MessageCatalogue($locale);
+
+            foreach ($locoCatalogue->all($domain) as $key => $message) {
+                if (str_starts_with($key, $domain.'__')) {
+                    $key = substr($key, \strlen($domain) + 2);
+                }
+
+                $catalogue->set($key, $message, $domain);
+            }
+
+            $translatorBag->addCatalogue($catalogue);
         }
 
         return $translatorBag;
@@ -166,13 +178,14 @@ private function getAssetsIds(string $domain): array
         }, $response->toArray(false));
     }
 
-    private function createAssets(array $keys): array
+    private function createAssets(array $keys, string $domain): array
     {
         $responses = $createdIds = [];
 
         foreach ($keys as $key) {
             $responses[$key] = $this->client->request('POST', 'assets', [
                 'body' => [
+                    'id' => $domain.'__'.$key, // must be globally unique, not only per domain
                     'text' => $key,
                     'type' => 'text',
                     'default' => 'untranslated',
diff --git a/src/Symfony/Component/Translation/Bridge/Loco/Tests/LocoProviderTest.php b/src/Symfony/Component/Translation/Bridge/Loco/Tests/LocoProviderTest.php
index 3d3dd8af985ca..09c779324310b 100644
--- a/src/Symfony/Component/Translation/Bridge/Loco/Tests/LocoProviderTest.php
+++ b/src/Symfony/Component/Translation/Bridge/Loco/Tests/LocoProviderTest.php
@@ -63,6 +63,7 @@ public function testCompleteWriteProcess()
         $responses = [
             'createAsset1' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $expectedBody = http_build_query([
+                    'id' => 'messages__a',
                     'text' => 'a',
                     'type' => 'text',
                     'default' => 'untranslated',
@@ -72,7 +73,7 @@ public function testCompleteWriteProcess()
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
                 $this->assertSame($expectedBody, $options['body']);
 
-                return new MockResponse('{"id": "1337"}', ['http_code' => 201]);
+                return new MockResponse('{"id": "messages__a"}', ['http_code' => 201]);
             },
             'getTags1' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $this->assertSame('GET', $method);
@@ -93,12 +94,13 @@ public function testCompleteWriteProcess()
                 $this->assertSame('POST', $method);
                 $this->assertSame('https://localise.biz/api/tags/messages.json', $url);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
-                $this->assertSame('1337', $options['body']);
+                $this->assertSame('messages__a', $options['body']);
 
                 return new MockResponse();
             },
             'createAsset2' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $expectedBody = http_build_query([
+                    'id' => 'validators__post.num_comments',
                     'text' => 'post.num_comments',
                     'type' => 'text',
                     'default' => 'untranslated',
@@ -108,7 +110,7 @@ public function testCompleteWriteProcess()
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
                 $this->assertSame($expectedBody, $options['body']);
 
-                return new MockResponse('{"id": "1234"}', ['http_code' => 201]);
+                return new MockResponse('{"id": "validators__post.num_comments"}', ['http_code' => 201]);
             },
             'getTags2' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $this->assertSame('GET', $method);
@@ -129,7 +131,7 @@ public function testCompleteWriteProcess()
                 $this->assertSame('POST', $method);
                 $this->assertSame('https://localise.biz/api/tags/validators.json', $url);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
-                $this->assertSame('1234', $options['body']);
+                $this->assertSame('validators__post.num_comments', $options['body']);
 
                 return new MockResponse();
             },
@@ -146,11 +148,11 @@ public function testCompleteWriteProcess()
                 $this->assertSame(['filter' => 'messages'], $options['query']);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
 
-                return new MockResponse('[{"id":"1337"}]');
+                return new MockResponse('[{"id":"messages__a"}]');
             },
             'translateAsset1' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $this->assertSame('POST', $method);
-                $this->assertSame('https://localise.biz/api/translations/1337/en', $url);
+                $this->assertSame('https://localise.biz/api/translations/messages__a/en', $url);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
                 $this->assertSame('trans_en_a', $options['body']);
 
@@ -162,11 +164,11 @@ public function testCompleteWriteProcess()
                 $this->assertSame(['filter' => 'validators'], $options['query']);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
 
-                return new MockResponse('[{"id":"1234"}]');
+                return new MockResponse('[{"id":"validators__post.num_comments"}]');
             },
             'translateAsset2' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $this->assertSame('POST', $method);
-                $this->assertSame('https://localise.biz/api/translations/1234/en', $url);
+                $this->assertSame('https://localise.biz/api/translations/validators__post.num_comments/en', $url);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
                 $this->assertSame('{count, plural, one {# comment} other {# comments}}', $options['body']);
 
@@ -193,11 +195,11 @@ public function testCompleteWriteProcess()
                 $this->assertSame(['filter' => 'messages'], $options['query']);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
 
-                return new MockResponse('[{"id":"1337"}]');
+                return new MockResponse('[{"id":"messages__a"}]');
             },
             'translateAsset3' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $this->assertSame('POST', $method);
-                $this->assertSame('https://localise.biz/api/translations/1337/fr', $url);
+                $this->assertSame('https://localise.biz/api/translations/messages__a/fr', $url);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
                 $this->assertSame('trans_fr_a', $options['body']);
 
@@ -209,11 +211,11 @@ public function testCompleteWriteProcess()
                 $this->assertSame(['filter' => 'validators'], $options['query']);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
 
-                return new MockResponse('[{"id":"1234"}]');
+                return new MockResponse('[{"id":"validators__post.num_comments"}]');
             },
             'translateAsset4' => function (string $method, string $url, array $options = []) use ($expectedAuthHeader): ResponseInterface {
                 $this->assertSame('POST', $method);
-                $this->assertSame('https://localise.biz/api/translations/1234/fr', $url);
+                $this->assertSame('https://localise.biz/api/translations/validators__post.num_comments/fr', $url);
                 $this->assertSame($expectedAuthHeader, $options['normalized_headers']['authorization'][0]);
                 $this->assertSame('{count, plural, one {# commentaire} other {# commentaires}}', $options['body']);
 
@@ -321,11 +323,11 @@ function (string $method, string $url, array $options = []): ResponseInterface {
                     $this->assertSame('https://localise.biz/api/assets?filter=messages', $url);
                     $this->assertSame(['filter' => 'messages'], $options['query']);
 
-                    return new MockResponse('[{"id":"1337"}]');
+                    return new MockResponse('[{"id":"messages__a"}]');
                 },
                 function (string $method, string $url): MockResponse {
                     $this->assertSame('DELETE', $method);
-                    $this->assertSame('https://localise.biz/api/assets/1337.json', $url);
+                    $this->assertSame('https://localise.biz/api/assets/messages__a.json', $url);
 
                     return new MockResponse();
                 },
@@ -334,11 +336,11 @@ function (string $method, string $url, array $options = []): ResponseInterface {
                     $this->assertSame('https://localise.biz/api/assets?filter=validators', $url);
                     $this->assertSame(['filter' => 'validators'], $options['query']);
 
-                    return new MockResponse('[{"id":"1234"}]');
+                    return new MockResponse('[{"id":"validators__post.num_comments"}]');
                 },
                 function (string $method, string $url): MockResponse {
                     $this->assertSame('DELETE', $method);
-                    $this->assertSame('https://localise.biz/api/assets/1234.json', $url);
+                    $this->assertSame('https://localise.biz/api/assets/validators__post.num_comments.json', $url);
 
                     return new MockResponse();
                 },
diff --git a/src/Symfony/Component/Translation/Bridge/Loco/composer.json b/src/Symfony/Component/Translation/Bridge/Loco/composer.json
index 550a2f5b6de74..36d2eea52cb6d 100644
--- a/src/Symfony/Component/Translation/Bridge/Loco/composer.json
+++ b/src/Symfony/Component/Translation/Bridge/Loco/composer.json
@@ -19,6 +19,7 @@
         "php": ">=7.2.5",
         "symfony/http-client": "^5.3",
         "symfony/config": "^5.3",
+        "symfony/polyfill-php80": "^1.23",
         "symfony/translation": "^5.3"
     },
     "autoload": {