I got an error message!
First, I forgot to mention, I am now only dealing with the refreshing of the token, since I am no longer having to query all of the campaign’s members. So the 401 I need to fix is only for the token endpoint with the grant_type=refresh_token.
Now for the error. I copied the URL I got from my app, which is the one the app uses to attempt a token refresh, and pasted it into Postman, and I got a 401 Unauthorized status, with the body { "error": "invalid_grant" }.
Is it perhaps what’s discussed here? That, since it’s a ‘creator’ token, I don’t need to refresh it (even though the client allows me to click “refresh” and grants me new auth and refresh tokens)?