I'm assuming you are using Analysis Workspace when you are getting this problem? I ask because this question is currently posted in our Experience Cloud catch all community. Once I confirm where you are getting the error from, I'll move the question to the correct community so our experts can advise.
Yes it is Analytics Workspace. However it seems the problem has been fixed. We suddenly got spammed with all the reports we were missing from days back. And now people are receiving their reports as scheduled.
Thanks, best regards,
I'll move this question over to the Analytics community in case they have some additional context around why that might have happened.
We performed a maintenance on our servers last week - Tuesday for the backend processing architecture, and Thursday for the front-end stuff. I'm willing to bet that it was due to that.