Look to the left, below my avatar. Does it look to you like I'm the kind of member who trolls people? I assure you, in the 7 years I've been here you are the very first person to suggest such a thing, so no, I was not trolling you. It would help to have images with better clarity in the future although I understand that in this case, after the fact, we know that the images weren't taken by you.
So, regardless of any other considerations, if this is a new board and it came that way with a pin missing then it is likely that if this WAS a new purchase, which you didn't answer, it was a return to whatever retailer or vendor it was purchased from by somebody who bent a pin and then broke it off while trying to straighten it. In ANY case of a new board, that came with the pinbed compromised, there is no way ever I'd recommend trying to use such a board. It should be returned to the retailer or vendor for replacement.
Even if you could identify the missing pins specific function you have no way, at all, ever, of knowing what else might have been damaged or compromised on the board and it is simply not worth the risk of potentially ruining other hardware by trying to use a compromised board.
If the board was purchased used, then all I can say is, I hope the owner feels extremely lucky because we see people ALL THE TIME who come here in similar situations, get realistic advice from people who've been doing this for a very long time, and then go ahead and do what they want anyhow. And then, generally, come back afterwards not understanding how suddenly their memory, or graphics card, or CPU, is now damaged.
Hardware is rarely, VERY RARELY, able to be repaired regardless that you will see all across the internet, indications by people that they've successfully done so using such and such technique. Mostly, it's pure BS. In some few cases some people have success but by and large when ANY component is damaged in any way that involves a non-removable part (And of course there ARE parts that can be replaced on some hardware such as some processor retention brackets, cooling assemblies, etc.) if you are not a very capable and trained electronics repair person, it shouldn't even be attempted much less should you attempt to use a known compromised part with hardware that you value.
My advice would be to tell the owner of this hardware to return the motherboard and not use it. Anything beyond that is simply rolling the dice and hoping for the best.
Could it still work, with only something like a specific SATA header or USB port not working? Sure, it COULD. Is that likely? Not really, and like I said, even if you knew what system that pin was specifically tied to, you have no idea what else might have happened during the (likely) previous owners botched attempt to use the board. And I say previous owner with pretty full confidence because motherboards simply do not come from the factory with pins missing. Not that I have EVER seen in 30+ years of doing this.