To pair the app to the car I have to first delete the existing pairing which I cannot do unless I log into the app and I can't lot into the app without pairing it first. Any solution?
I have the same problem. I've experienced this several times since I bought the car -- very irritating! I've tried a number of things, including doing a factory reset and then adding users from scratch. That worked, but wasn't that much fun.
What I've resorted to now is just adding a new user and going through the Volvo app connect process (I am able to use the Volvo ID from before). So now I have an Admin that can't use the app (for the same reason you have), plus 2 "users" (my wife and I). I'm sure this is not the "proper" way to do this, but it works for me until I have an occasion to get to the dealer later.
BTW...I've tried to "make me an admin" after adding a new user, but it comes up with some error that says "have to disconnect the Volvo app from the car first" or something like that, which I have no idea how to do. I sure wish there was a simple way to do this re-connect process...as I said, it's happened to me a number of times in the 5 months I've had the car.