Outage in Microsoft 365
Some users may be unable to access Planner on the web
Resolved Minor
March 02, 2026 - Started 5 months ago
- Lasted 5 months
Incident Report
Summary AI Generated
Some users were unable to access Microsoft Planner on the web on March 2, 2026, between 7:15 AM and 5:25 PM UTC. The issue was caused by a Microsoft Authentication Library (MSAL) update that created a mismatch between the unauthenticated Planner landing page and the post-sign-in authenticated experience. Microsoft resolved the incident by realigning the MSAL across both experiences, with Planner via Microsoft Teams available as a workaround during the outage.
Title: Some users may be unable to access Planner on the web
User impact: Users may be unable to access Planner on the web.
More info: As a workaround, some users may be able to access Planner via Microsoft Teams.
Current status: We're reviewing support provided information and service monitoring telemetry, to isolate the source of the issue and establish a fix.
Scope of impact: Some users that are trying to access Planner on the web may be impacted.
Next update by: Monday, March 2, 2026, at 4:30 PM UTC
Components affected
PlannerTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
5 months ago - at 03/02/2026 08:03PM
Title: Some users may be unable to access Planner on the web
User impact: Users may have been unable to access Planner on the web.
More info: To bypass the impact, some users may have been able to access Planner via Microsoft Teams if this option was available to them.
Final status: We've confirmed with a subset of affected users that updating the Microsoft Authentication Library (MSAL) to resolve the mismatch has remediated the impact.
Scope of impact: Some users that were trying to access Planner on the web may have been impacted.
Start time: Monday, March 2, 2026, at 7:15 AM UTC
End time: Monday, March 2, 2026, at 5:25 PM UTC
Root cause: An update to the Planner MSAL introduced a mismatch between the unauthenticated Planner on the web landing page and the authenticated experience after users signed in. This mismatch resulted in the impact.
Next steps:
- We're reviewing our standard update protocol to ensure future updates are applied with the proper cadence to prevent similar mismatches from occurring.
This is the final update for the event.
5 months ago - at 03/02/2026 06:09PM
Title: Some users may be unable to access Planner on the web
User impact: Users may be unable to access Planner on the web.
More info: To bypass the impact, some users may be able to access Planner via Microsoft Teams if this option is available to them.
Current status: We've confirmed that an update to the Planner Microsoft Authentication Library (MSAL) is introducing a mismatch between the unauthenticated Planner on the web landing page and the authenticated experience after users sign in. This mismatch is resulting in the impact. We've updated the MSAL to be aligned across both experiences, and we're validating this has resolved the issue with a subset of affected users.
Scope of impact: Some users that are trying to access Planner on the web may be impacted.
Start time: Monday, March 2, 2026, at 7:15 AM UTC
Root cause: An update to the Planner Microsoft Authentication Library (MSAL) is introducing a mismatch between the unauthenticated Planner on the web landing page and the authenticated experience after users sign in. This mismatch is resulting in the impact.
Next update by: Monday, March 2, 2026, at 8:30 PM UTC
5 months ago - at 03/02/2026 04:10PM
Title: Some users may be unable to access Planner on the web
User impact: Users may be unable to access Planner on the web.
More info: To bypass the impact, some users may be able to access Planner via Microsoft Teams if this option is available to them.
Current status: We're reproducing the issue within our internal testing environment to collect further diagnostic data to aid in our troubleshooting and identification of the source of the impact.
Scope of impact: Some users that are trying to access Planner on the web may be impacted.
Next update by: Monday, March 2, 2026, at 6:30 PM UTC
5 months ago - at 03/02/2026 02:32PM
Title: Some users may be unable to access Planner on the web
User impact: Users may be unable to access Planner on the web.
More info: As a workaround, some users may be able to access Planner via Microsoft Teams.
Current status: We're reviewing support provided information and service monitoring telemetry, to isolate the source of the issue and establish a fix.
Scope of impact: Some users that are trying to access Planner on the web may be impacted.
Next update by: Monday, March 2, 2026, at 4:30 PM UTC
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