Upgraded to 20.4.
adminconsoleapp 20.4 works, after login get the http status 408 - with a timeout message.
Followed this article, deleted wasp etc, and re-installed, but get the same error
Release : UIM 20.4
Component :admin console
Reinstalled again, just wasp and adminconsoleapp and cleared cache on all browsers, then installed uimhome app which resolved the issue