Cannot activate cellular on Apple Watch Ultra.
I recently received an Apple Watch Ultra as a gift from a different carrier. The Apple Watch is currently on a standalone account with Verizon. (Only device on the account.)
My iPhone currently is on a T-Mobile Plan and I cannot activate cellular as when I attempt to activate, it takes me to a T-Mobile website. There are no other options to activate it on Verizon. I verified with the account holder and the Apple Watch has its own phone number and plan.
What else can I do?
Apple Watch Ultra