Suck in a TV Provider Authentication Loop on Fire TV/Stick

Every app I try to sign in with Xfinity credentials shows the authentication was accepted but then brings back up the page to choose from a tv provider. ( ESPN NBC SYFY and so on...) After searching the web I found this has been a problem for people at least 2yrs now. No one has a fix for this either. I have multiple Fire Sticks and some devices have no issues but others do not work. This has become very frustrating to say the least. Does anyone have any suggestions? All are fully up to date and credentials are fine.