Hi @Nelson1991.
Welcome to our community forums and thank you for your first post.
Sorry to hear you are unable to update your my VM app with your new account number. We can understand your concern and want to do our best to help. Just to clarify, do you get an error code or message when trying to update the app? If so, are you able to provide a screen shot (while omitting personal details)? Also are you able to log into your account via web under your new account?
Thanks,