Hello AshFeGo,
Welcome to the community!
Firstly, you should note the forums are community-driven and not intended as a venue for customer services. We do not have access to customers' accounts nor would we know the details of your situation.
That said, I understand you have had your line under your parents' account. Were you intending on keeping the phone number associated with that line? If so, that would have been a Transfer of Responsibility (TOR) of your line. Creating an account would not have transferred your line. It should be noted that there would be a fee for the transfer (see here).
The new account you opened would have been for a new line and new phone number. In addition, that new line and number would have been associated with a new SIM card. That would likely be the reason why the app does not recognise the account you opened. The app would use your old phone number which is still under your parents' account.
In order to transfer your line to your account, your parents would first need to contact customer service and notify them of your intent to transfer the responsibility of your line. You would also need to contact customer service and notify them of your intent to take responsibility for the line. I do not know if they'll be able to transfer the line to the account you opened. However, they would not be able to port your number to the new line your opened. They would then need to contact them to complete the transfer.
Hope this helps 😀
Cheers
