It looks like Samsung has silently removed the option to unlock the bootloader from One UI 8.0 onwards as it has been reported by some users in the forum (here, here). By reversing the Settings app code we can take a deeper look about how and...
Page 35. I haven’t confirmed anything, so do your own research!
Recently sold mine after the OneUI 8 update. S24U to a Pixel 10 Pro XL with GrapheneOS. Loving it.