I couldn't really leave it, so I just tried again, and now it worked?
I did:
Double Checked:
Android is version 11 (Build fp4.fp4k.a.179.20230116
$ fastboot flashing unlock
FAILED (remote: ' Device already : unlocked!')
fastboot: error: Command failed
$ fastboot flashing unlock_critical
FAILED (remote: ' Device already : unlocked!')
fastboot: error: Command failed
Checked All three boxes (Including User Wipe)...
Maybe you were right, Luksus (and thanks!), that I somehow missed the first check box, but alas, I'm a happy camper..
Regards
Grisen