The settings are tied to the key you use - definitely!
As "guest" you definitely won't get any sort of settings persistence either...
You can reset the car, go into the settings and do a factory reset.
If that doesn't work you can go full nuclear - go into the MyVW/WeConnect website, delete the car from your profile.
In fact, I had to do this in order to become primary user in the first place, because it wasn't working. Delete car, re-add car from VIN. Goto car, login with my VW password, click "become primary user", enter my S-PIN, authenticate with both car keys.
After that, when it next asks you to enter your S-PIN (ie next time you start the car from cold), enter it and tick the box saying "don't ask me again".
Should be fine after that.
There continues to be changes on VW's servers that cause this problem, they are messing with things daily/weekly that cock stuff up. Its super unstable.