Can't get my boot unlock code

[Volker]

The error code is not the same, but still sounds similar, so did you try out what’s mentioned here?

Bootloader Unlocking site throws invalid IMEI / serial number error

I also had this problem “incorrect number” yesterday and contacted Fairphone support. An hour later I was told to delete all cookies and try again in a private window. I thought at first, usual blah blah, but did it anyway. Lo and behold, I got a code displayed. Of course, I don’t know if Fairphone Support has done anything else