User impact: Admins may be unable to deploy custom add-ins from the Microsoft 365 admin center and users can’t access add-ins.

More info: Admins see an error stating “Learn more about eligibility requirements”.

Users also report being unable to access deployed add-ins in relevant services such as Exchange Online. Affected add-ins we’ve validated include, but may not be limited to, the following:

– My Templates add-in
– Salesforce add-ins
– Viva Insights add-ins

Current status: Following our completed internal tests with affected users, we’ve confirmed that our fix will be viable for remediating the impact. Our fix has completed approximately 25 percent of the necessary deployment, and since beginning, our internal service telemetry is reporting a reduction of internal add-in errors. As we monitor the remaining deployment, we’ll provide an updated timeline for impact being remediated once it has become available.

Scope of impact: Some admins may be unable deploy custom add-ins from the Microsoft 365 admin center and all users may be unable to access deployed add-ins. This information may be updated as our investigation continues.

Start time: Wednesday, January 21, 2026, at 10:27 AM UTC

Root cause: A recent service change designed to enforce stricter authentication requirements blocked admins from deploying custom add-ins from the Microsoft 365 admin center and blocked user authentication requests from completing.

Next update by: Wednesday, March 18, 2026, at 10:00 PM UTC