After adding accounts, see if you are experiencing the same problem in this test file. From there, you can then switch back to your original file.
Follow the steps below to switch files:
Quicken will list the most recently opened data files, with a checkmark next to the file you are currently viewing.
Let us know how it goes!
Thank you for following up with the test file results.
Since you did receive the same error message in the test file, this does confirm that there is an issue within the server. In this case, we advise that you please contact Quicken Support directly for further assistance and possible escalation if they see fit.
We apologize for any inconvenience! Thank you.