I am having the same issue with a recently built Windows 11 machine, but with a few differences:
- New 11 build and updated as of today.
- Trying to connect to a printer on a domained print server.
- All my Win 10 machines connect fine. I can login to my laptop (not domained) and then connect to the FQDN server. I get prompted for creds and I enter them as Domain\user. That lets me into the print server with no issue.
- Then I right click on the printer and click connect. I get prompted for cred again (on a prompt that looks like Win 7). When I enter the same credentials in the same format, I get the error - "Credentials Supplied Are Not Sufficient"
I tried the above steps with no change.