Okay, thanks for marking the solution and sharing what is happening in your instance. Sorry to hear that there’s still an issue.
If we could reproduce the issue with at least only one or two UGs, it would be very helpful. The point is to create an environment where this can be tested and triaged to the developers.
Thanks!
---Update:
I think the issue might be related to changes in Dashboard sharing settings. Please check the release notes for version 2.40 and 2.41. Also, mentioned here: Dashboard saving - Error - After upgrade to 2.40.x - Any thing changed? - #2 by Gassim