Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello, good day and thanks for your question. I understand that you are trying to setup the recurring billing for your Microsoft 365 subscription.
If this is being required by the bank even before you have tried setting this up then it will be best to check and reach out to them to see if they can provide an alternative for this as this is usually a requirement for security purpose specifically to determine if this is a valid number that is owned by you.