Investigating a spike in 401 authentication errors

resolved · 16 Jun 2026, 01:42

Auto-resolved by the status page: the vendor stopped reporting this incident in their feed.

investigating · 16 Jun 2026, 00:06

We are actively investigating customer alerts of 401 authentication errors when pulling images from mcr.microsoft.com. We’ve identified a potential underlying factor related to a recent update made to a backed service and we are actively working on determining mitigation workstreams. More information will be provided shortly.