Clicking the button to open Admin Console points to the Primary hub IP address, and it is possible it is not accessible externally.
In prior versions, it was possible to add the raw configure key adminconsole_url to the ump_common section of the UMP wasp to specify the external IP address not the backend ip.
Release : 20.3
Component : UIM - OPERATOR CONSOLE
Use the format: https://<FQDN>:<ssl port>/adminconsoleapp/
2. Click Apply/Ok
wasp will restart.
3. Test again
For 20.3 ump_operatorconsole_2.08_HF3 or later is required.