Hi Gerald Fonseca,
Welcome to Microsoft Q&A.
This behavior isn't typically caused by a local client cache issue (which matches what you saw after clearing cache/signing out/restarting). Teams may auto-generate chat threads for PSTN/Call Queue calls, and in some configurations this can result in a new thread being created per call.
Microsoft is aware of similar reports involving autogenerated chats in Direct Routing and Call Queue scenarios, and fixes are being deployed. The best way to check if your tenant is affected or has received the fix is to review Service health in your Microsoft 365 admin center.
Suggested next steps
- Check Service health: Have your tenant admin review any active or recent advisories related to Teams calling or chat creation in Microsoft 365 admin center > Health > Service health.
- Confirm scope Test across: Teams web, New Teams, and Classic Teams with multiple agents. If the issue reproduces across clients and users, that points to a service-side cause.
- Optional diagnostic test: As an exploratory step, you could temporarily disable Conference Mode on one queue, test a few calls, then re-enable it—though this is not a documented resolution.
- If you need escalation If Service health shows no relevant advisory and the issue persists, gather:
- Sample call times
- Affected users and queue/resource account details
- Screenshots of repeated chat threads
Then open a Microsoft support case under Teams Phone > Direct Routing.
Note: Call Queues and Direct Routing are Teams Phone (work/school) features, so resolution typically requires tenant admin access (Service health + support).
Please let me know if this proves useful to you, or if you would like further assistance.
I'm looking forward to your reply.
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