Background: I have been a user prior to the new subscription model and have been happily syncing content across a Windows PC, Android tablet, and an Android phone. I got a new phone (yea me!) and now I can't register the app.
It has been a long time since I've had to do this, so I fully accept that this is likely user error. I just need someone to point me in the right direction here, I keep getting this error and see no other way to login/register the app so I can sync data.
I have tried FAQ's and articles and I must be missing the part for existing users on a new device.