@lambio hmmm. That code value changing seems to indicate that the authorization code grant isn't completing. This might cause the behavior you are seeing (because the tokens never get stored in the browser).
Are you running both systems on localhost? Are you using docker?
Sharing a bit more about what the system looks like would be helpful.
Another thing you can do is enable debugging in your fusionauth application configuration (go to the admin panel, edit your application, enable debugging) and then viewing the event log (go to system -> event log) as you try a login. That might be helpful info to share as well.