Hello @Peter Van Acker,
Thank you for reaching out to the Quicken Community with this question.
Quicken does not make the decision regarding which phone number is chosen to receive the 2FA, you will need to reach out to your financial institution for further assistance. It is recommended to request to speak to a tier 2 representative or a supervisor as they are generally more familiar with third-party applications such as Quicken.
I hope this helps!