Anecdotal evidence to support this - on a much less important platform.

We have two cars from our local car dealership. When we first set up the account, we did it through what I assumed were some kind of AI voice prompts. First time we take my wifes car in? I'm getting the calls from the dealership about whats wrong. Then I start getting texts telling me the car is ready. Same thing with her, but she's getting all the calls and notifications when we take my car in.

This has gone on for THREE YEARS. Last year we just gave up after telling people in person and going online and changing it several times. It did work for one visit, then reverted right back to mixing them up.

This isn't nearly as important as your banking issues, but its in a completely different industry and the experience is nearly identical.