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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 the root cause: on June 26 at 05:57 UTC, Microsoft Azure AD Internal - Jit Provisioning failed to provision "Dunloe Dataplane Service" in our tenant (multiple SpnValidationException errors, only 1 of 6 succeeded).
We have verified all settings are correct:
- Get-CsTenantFederationConfiguration → AllowFederatedUsers: True, AllowedDomains: AllowAllKnownDomains
- Get-CsExternalAccessPolicy → EnableFederationAccess: True
- Entra Cross-tenant access settings → All B2B inbound/outbound: All allowed
This appears to be a Microsoft-side provisioning issue. We need Microsoft to re-provision the Dunloe Dataplane Service for our tenant.
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This is not a support channel, open a support case via the admin center.
