I changed the body type to raw (since form data also returned an error).

This seemed to resolve that issue but not I’m getting this error code:
Status code 400 {“error”:“invalid_client”}

Which means it’s an incorrect authorization header.

Spotify’s documentation:

I encoded my my client id and client secret using “https://www.base64encode.org/” in the format in the image below.

Then I pasted the returned code like this. Am I doing this wrong?