PLEASE help me figure how how verification works

So I’m trying to genuinely figure out the verification process in these protocols that promise their solutions to aid in “identity”.

Honestly, and I’m being genuinely curious, I don’t exactly know what all these things come together to do what organizations, and generally people, need these products to do. If you need a better idea of what I’m trying to figure out, please see the following example:

PERSON A is part of ORGANIZATION. At this point, ORGANIZATION needs to verify that PERSON A is a member of ORGANIZATION (for security reasons). For the ORGANIZATION purposes, they need this verification for two aspects of their business with their clients: LOGIN and EVENTS (log-in to a portal, events for access)

How in the mutherflipping hell does ORGANIZATION validate the membership of the NFT or wallet address? I would love some different perspectives, opinions, and reasonings over solution companies and organizations are offering to aid in this