Ran Rafael To use bunq, you must be a resident of an EEA country. So you need to provide your TIN from one of these countries. If you also have tax obligations in other countries, you should afterwards additionally supply the TINs from these countries, too. But first and foremost, you need the TIN that you have from your current country of residence.
In what country to you currently reside in, then? Is it not the Netherlands?