After a long long long time abandoning and coming back to this over and over...I finally solved the problem. Multiple things needed to happen. 1. use Chome (not beta or Dev.....Chrome Custom Tab was not being created properly...which is lame) 2. USE https://joaoapps.com/autoweb as the Callback URL.....this is new information! Once I did this, it worked. Using autoweb://auth as suggested did not work....maybe update your AutoWeb tutorial link to reflect this information.