Random pipeline failures: AADSTS135010… anyone else?

In the last week our Fabric pipelines started randomly failing with:

Failed to get User Auth access token. AADSTS135010: UserPrincipal doesn't have the key ID configured.

These pipelines have been running fine for ages. No auth changes on our side. We’ve been able to fix some of the broken connections by just opening the connection, changing something tiny, and saving. But others stay broken no matter what we try.

Feels like something changed with how Fabric refreshes user tokens? Are others seeing this too? Is this a known issue? Before I blame this onto Ignite coming up next week, I’d love to know what’s actually going on.

Thanks!