I have a strange problem.
Windows 2012r2 HyperV DC
Windows 2012r2 HyperV server member
Windows 2019 HyperV server member
Windows 2019 "physical" server member
Everyone pings everyone and the DC is manually entered as DNS.
Also, full visibility of all AD members, shared folders, etc.
When I log in as Domain Admin to a server (locally or via RDP)
everything seems to work fine, HOWEVER - if I try to change or access Security options, I get the "username / password" prompt.
After entering the exact same credentials that I used to log in to the server, I get the
"the following error occurred while using the username and password you entered.
The username or password is incorrect."
Can someone point me to the solution that does not include "erase everything" or "I think something is broken"?