With token authentication and SOAP within NetSuite, do they provide a way to authenticate the oauth token information?

Can you reword the question? NS has to verify the token information else TBA wouldn't be a very useful authentication mechanism. Maybe you mean validating the token client-side before sending to NS?

Yeah, we need to validate the token rather via postman or client

do you have to do this? its either gonna let you go through with TBA or not

that's what I was planning on doing, but the netsuite admin wanted me to check first lol.

your oauth library may have a validation function, but since the token is something you create client side I'm not sure what it gains you. NS may have a token verification endpoint? If it's just an attempt to ensure you have a sane token you could do some checks that the header looks like a proper oauth token, but only netsuite (the receiver) that actually verifies it.