Unable to upgrade at Apple due to not being an authorized user

I walked into Apple trying to upgrade to the IPhone 17 Pro. The associate had me scan his QR code and my mom (the other person on my account) showed up and I was not an authorized user. I explained I have upgraded directly at Apple many times before as an authorized user without trouble, I even showed them on my T-Mobile app that I’m the primary account holder and an authorized user. They didn’t budge and wouldn’t sell me the phone without her being present. No, I’m not a minor and no there have not been any recent account changes.

Is this something new? Is this a T-Mobile thing?