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Version

What package version of the SDK are you using.

botbuilder-integration-aiohttp~=4.14.5

Describe the bug

Give a clear and concise description of what the bug is.

On installation, we receive and process installation events. From this, we get a Conversation ID, which we use to send messages.
For ~1% of our user-base (more than 5.000 live users, -> ~50 users with this issue), sending a message returns ConversationNotFound error.
After asking for feedback:

• none of them blocked the bot
• none of them deleted the conversation
• the problem started occurring later in time for some of them.
• for some, it seems resolved at random.

To Reproduce

Steps to reproduce the behavior:

Irreproducable at lower scale, but at large scale:

1. Install a Teams bot in Microsoft admin center.
2. Capture all installation events and store the Conversation ID for each person.
3. Send out messages once a week to everyone
4. Start seeing ConversationNotFound messages on a small group of them.

Expected behavior

Give a clear and concise description of what you expected to happen.

When the bot is not uninstalled, blocked by user, or blocked by admin, sending a message should work or not work reliably.

Screenshots

If applicable, add screenshots to help explain your problem.

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Additional context

Add any other context about the problem here.

It is a difficult resource to find documentation for, these errors and what causes them.

Feel free to ask for more context, or point to documentation I must have missed.

Tracking Status