Okay then, I give up using MacOS (Monterey) for now.
One final question:
When under mac it asks for name or username, what is the
default username for the hotspot device having the
Slate GL ATX 1800 one? Maybe if gets the “correct”
username to satisfy MacOS (the credentials to be entered
along with the password of the device), maybe it will work.

Otherwise, later I will get another MacOS computer running Mojave
and see how that one behaves. Maybe it is just that Monterey
does something differently – I recently upgraded to Monterey

Thank you.