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RichardTilman1's avatar
RichardTilman1
Copper Contributor
Jun 29, 2026
Solved

External Teams federation broken after Dunloe Dataplane Service provisioning failure

Repost without tenantID Since June 26, all external Teams chat/federation is broken for our organization. Messages to all external users fail with "Send failed". In our Entra audit log we found t...
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  • VasilMichev's avatar
    VasilMichev
    Jun 30, 2026

    This is not a support channel, open a support case via the admin center.

Jamony's avatar
Jamony
MCT
Jul 08, 2026

Hi, since this affects all external federation and you have an Entra audit event pointing to a provisioning failure, I would treat this as a tenant/service-side issue rather than a client problem.

 

I would check:

 

1. Teams admin center > External access settings.

2. Microsoft 365 admin center > Service health for Teams and Entra.

3. Whether newly created test users have the same external chat failure.

4. Any recent federation, cross-tenant access, or domain allow/block changes.

 

If everything is configured correctly, open or update a Microsoft support case and include the exact UTC timestamp, failing workload name, correlation/request IDs if available, and a fresh message trace/repro. This is the kind of issue support may need to repair on the backend.