iCloud locked - datastore assignment is locked

As of today, I started seeing “Datastore assignment is locked” on Due.app syncing. I logged in to iCloud.com and see a white page with 503 errors in the logs. On the Files app on iOS/iPadOS it reports NSFileprovider-ErrorDomain error -2005. Files shared with my wife can not be dowloaded on her iPad, same error.

I started a chat with support, they transferred me to phone support. 1 mac belongs to work so I had Corporate AppleCare, so they started to reroute me. Then asked if I had a developer account, I do but it has been inactive since 2017. Because I have a developer account, I have to use their support. Which is email-based. No

Does anyone know what might be the issue? I now have to wait 1-2 business days for them to get back to me.

And, now it’s working again. No word from Apple yet.