vRealize 7.4 - AD integration fails ERROR_BAD_FORMAT

Hello,

I'm trying to add a domain to my vRA environment.

However when doing that I get the error => Could not join domain: Error occurred while joining domain. Verify Domain Admin username and password is correct, and the username is the sAMAccountName. Failed to join domain. Error Code: ERROR_BAD_FORMAT. Message:

I'm sure the userids are correct.
I can resolve the domain on my appliances and there isn't a firewall in between.

I've found the same issue here in the community but there wasn't any feedback on how it was solved (Vrealize 7.0 integration with Active directory )

Anybody has some ideas on how to solve it?