Error: "Authorization missing. Please, add an authorization token at the 'Authorization' HTTP header."

Your question may already have an answer on the community forum. Please search for related topics, and then read through the guidelines before creating a new topic.

Here’s an outline with best practices for making your inquiry.

My question:
I added all variables (in Environmental and Global).
When I selected “Post” and send, I am getting this error message:

{
“error”: “Authorization missing. Please, add an authorization token at the ‘Authorization’ HTTP header.”
}

Details (like screenshots):

How I found the problem:
I tried putting in all variables and tried with “Post”.

I’ve already tried:
Deleting variables that I have and re-created environment.