Find my Mac pin

i Locked my Mac when I moved with my iCloud. I’ve now have gotten my Mac set up at my new home several months later and my its saying to enter pin to unlock my Mac. I went on my iCloud and it shows the imac and the location but isnt offering me an option to “unlock” the Mac or providing me with a pin to unlock it with. I tried generating one with two factor but it didn’t work. I can’t remember if I assigned a pin when I locked the mac or if it is something iCloud would provide me to enter. Usually it will offer an “unlock” option like when an iPad or iPhone is missing and locked I simply unlock it on this page and it’s not offing me that option at all. It shows play sound and that’s it - I entered the PIN numbers I may put on my devices and none worked so something provide me with assistance to find my pin on iCloud find my Mac or if I put my own pin I can go into my passwords and enter them all I didn’t want to enter a bu ch of puns as it locked me out when a wrong one for 5min and I entered the ones I usually use I can’t recall if I set it but if so i can brainstorm But if there is an easy way of bypassing this let me know - the Mac doesn’t have much on it so I can reset the entire computer it was backed up regularly I just am stuck on this lock page and I’m more of a windows expert than mac