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I call that the Tesla arrogance. They would basically tell you to cancel if you didn't like what they told you - I got this when I queried my referral miles not being applied to my account and when they put cost of FSD up by £1000 when I added tow hitch to my order.
If only... No, I found that I kept getting booted out of the app on my phone (forgotten the error now). Tesla support had no idea, but a helpful reply on the Facebook forum from someone who had had the same problem correctly identified the issue as something that happens when there are two phones using the same Tesla account login. The solution was for my wife to setup a Tesla account of her own, add the car to it, and then use that login on her app.
Interesting - I've not had that experience with my wife and I using one account linked to our car and each with the app on our phones?
In fact I wouldn't have thought it was likely that you could link two accounts to one car for some reason - seems counter-intuitive. Anyway - it obviously does work