@Sapphire76 Hopefully can unlock fine with Find My Mobile. An alternative is Google Find My Device https://support.google.com/accounts/answer/6160491?hl=en
Whilst these are the best options alternatives here https://samsungtechwin.com/unlock-samsung-phone/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .