First, I must admit , for testing purpose I have installed macOS Big Sur on my mobile Mac. I know macOS 10.16 it’s not officially supported, but Cubase 11 works fine so far with this system here.
Except the login in VST Connect Pro 5.0.1. With Cubase 11, when click on login, after a while of spinning wheel it says “please enter email & password”, although everything is entered correctly already.
When I go back to Cubase 10.5. login works as expected.
On Monday I can test it on my Mac mini where Catalina is installed.
Anybody has problems with VST Connect login in Cubase 11?
… don’t forget : The latest OS 10.16 is not supported yet. We have to do some more investigations. Meanwhile. Can you please install the “VST Connect Performer” application? Can you login there? I guess you’ll check it with your MySteinberg account, yes?
besides the firewall settings you should also have a look into macOS System settings → Safety → and then the tab rightmost, it’s “Datenschutz” in German, could be “data protection” in English. Go through the column at the left and see if Cubase 10.5. -Cubase 11 and VST Connect Performer are checked everywhere they appear:
I don’t know how to add an application manually here, sorry.
Usually, when you launch an app for the first time on your system, it appears in the list of the different entries like “camera” “microfon” “disk access” and so on. All you have to do then is to enter your admin password an enable the permission for the app that did the permission request here.
What is your system version?
Edit: did you check all the entries in the left column?