verandabrabantbv You are probably on the Travel membership, which only includes a Mastercard which you can use to make card payments. It does not include a full bank account. So if you want to make bank transfers, use direct debits, iDEAL and more, you would need to have at least a Premium membership.
You can still cash out your remaining balance to another account of yours if you don't want to upgrade of course. https://together.bunq.com/d/13634-how-do-i-withdraw-money-from-my-bunq-travel-card (Notice: The + button in these instructions has been changed to a lightning bolt ⚡ in a recent update, the rest should be the same.)
You can compare all bunq membership types here: https://www.bunq.com/benefits
And a full pricing sheet with all the details is available here: https://www.bunq.com/pricing-sheet