FP3 Android 13 not possible to enter OEM unlocking code

Ok, with OEM unlocking enabled this is officially odd.

Safe route: Contact support (forum consensus is to call them for a chance to get results quickly) … https://support.fairphone.com/hc/en-us

Adventurous route: Fairphone 3 unlocking without oem unlocking
(if this still works, last mention of it working I found was end of August 2022)

I would recommend the safe route first.