I concur. Adding a new payment method during ordering gave me this excact error aswell. After (having to) press cancel, and going back and redoing the process but chosing an existing (new) payment method, I could verify and complete. On a PC. It suggests the error is consistent, but easy to work around.
I assume no risk in this, the subscription is linked to the account, and accordingly you couldn’t be billed twice by mistake.
[Edited by Blizzard] This thread has been inactive for some time. Please be mindful of resurrecting older threads. A new or more recent thread can be created to continue the discussion. Locking this thread.