I got a web app I'm trying to sync with its' App registration I've created and I can't really see the problem. The redirect URL specified in the app is the same as the one I'm trying to connect with, I've made sure of that and also I made sure that on the Authentication section in the App registration that exact URL is listed on the Redirect URIs list, which is what I've seen to be the problem on many similar tickets but that didn't seem to solve my case. Anyone has an idea of anything else I could check?