No "new password client" in suiteCRM8.2.2, how to verify the client is created and works?

Hi,
Since I’m having trouble to create a “new password client” in 8.2.2 (there seems no such client?) I created a normal OAuth2-client under Admin, OAuth2 Clients and Tokens.

Is there a way to test if the client secret/Password, the client works by console or stuff?

Is there tutorials how the paths need to be to connect those clients, for example to connect nextcloud?
I always get only
"Could not detect any host in /.../public_html/suitecrm/public/legacy/Api/index.php/V8/public/legacy/Api/access_token",
Any ideas how to fix/test, so I can make sure the client is propper working?