I have the issue highlighted in this KB VMware KB: View Manager does not let you remove an invalid View Composer domain user from the QuickP...
I have run the script in SQL with the domain and username but once executed just says 0 rows affected. And the Domain remains.
This would have been built in View 4.6 and I am now on 5.3 if this makes any difference.
The domain trusts have been removed.
Thanks
