hmm, puzzled face (did i get this wrong ?) it should work, can you check with HWinfo on the summary page bottom right. You are not using TPM device ?https://www.hwinfo.com/download/
To read - UEFI BOOT (in green) and Secure Boot (in grey) would be success.
EDIT: I just checked and works on my system. Did you remember to save and exit ?
or did I misread your post....eek.