Postman returns 401 with valid token for GET request

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My question:

I am getting 401 error when trying to validate get request.

Details (like screenshots):

I am using the bearer token authentication process to validate my request. However, I am getting below error when calling GET method.

Status Code:401
Error Code: BIZ064
message: " Full authentication is required to access this resource"

How I found the problem:

When I am using HTTP GET request. But for the same authentication, my POST is working fine and I can see the responses.

I’ve already tried:

I have checked the authentication process at the collection level and everything seems to be working fine.
Could anyone please help me to debug this issue as the error message is very generic and unable to drill down further?