Authorization is required to perform that action after Google redirect

I’m trying to set up a standalone Apps Script to list and process files from Google Cloud Storage. In trying to following the example from the README, I am unable to get my script to complete the redirect portion of the OAuth2 flow.

I am able to successfully see the Google authorization screen and click the Allow button, but when my browser redirects to the script’s URL with the /usercallback?state= path and query string, I see the following message.

Authorization is required to perform that action.

I’ve dug into the ScriptApp documentation (https://developers.google.com/apps-script/reference/script/script-app#newStateToken()) and actually just tried testing hitting the callback URL without going through an actual authorization from Google and I still see the same issue. It leads me to believe that there is something wrong with the permissions on the Apps Script despite the fact that I am the owner of the script and there’s a single sign-in active on my machine.

I’m curious as to whether this is specifically related to the library, or to my method of using a standalone Apps Script in general.

[erickoledadevrel]

The Apps Script team pushed out a new build that they believe should resolve this issue. Let me know if you see otherwise.

[prodonjs]

I was able to successfully get the example to work!

For me, I had to explicitly set the oauthScopes property in the appsscript.json manifest file to the following:

"oauthScopes": [
    "https://www.googleapis.com/auth/script.external_request",
    "https://www.googleapis.com/auth/userinfo.email"
  ]

Adding those explicitly allowed the redirect function to be called which successfully completed the OAuth authorization.