IOM can only support migrants who wish to return to their country of origin to reinstall themselves there permanently and who are not planning to return to Europe after arrival. When departing from the Netherlands, you sign the ‘departure declaration’ giving permission to end any pending permit procedures or to revoke your residence permit.
If you do not stay in the Netherlands legally at the time of your departure, you might receive a re-entry ban from the Dutch authorities. The assistance of IOM with your return cannot prevent this. You can find more information on the regulations of the Dutch government on the entry ban through this link: IND: Entry ban, return decision and pronouncement of undesirability