How do you change the phone number the code is sent to, to authenticate a shared user with the invite

How do you change the phone number the code is sent to, to authenticate a shared user, when they accept the invite? I deleted the shared user and re added her, but it only asks for her email address, not her phone number, and then when I send the invite to share, it sends the authentication code to her old number. I tried the chat, but all they did was send me an automated reply telling me how to add a user, which does not answer my question. I wasted nearly 2 hours on that chat, to then be cut off because your staff took too long to come back to me. The second attempt, I missed the reply, and was cut off because I took more than 7 minutes to reply ( a bit rich considering how long I waited). On my third attempt, I waited 1 hour for someone to reply, and then gave up. This is not good customer service at all. My wife needs to have access, just like I do, as I am not always there. As for COVID19, you've had 2 years to get setup to operate with it, so that's no excuse anymore. The fees charged are what I would consider premium level, but the level of service I've had since day one is crap. Get your act together!