Identity-Crisis | Burp Suite extension that checks if a particular URL | Plugin library

I'm trying to make a Google sheet that integrates with the YouTube Data and Analytics API. However, when trying to implement this, I came into a known issue with regards to allowing brand YouTube accounts/channels to be authenticated with a Google app which is explained here. https://issuetracker.google.com/issues/36764531

To get around this, the document mentions instructions from this link which I am now trying to implement myself https://mashe.hawksey.info/2017/09/identity-crisis-using-the-youtube-api-with-google-apps-script-and-scheduling-live-broadcasts-from-google-sheets/

From the instructions, I have:

1. Imported the necessary libraries into the script
2. Added the necessary Google Apps Script code which is at the bottom
3. Created my own OAuth 2.0 Client ID credentials in the Google Cloud Console

However, in the first link, a comment had also been added to say that while the instructions still worked, the script project now has to be associated with a cloud project and so that's what I did. As part of this, it created its own OAuth 2.0 Client ID which I believe it's now using rather than the credentials I had already generated myself. I have added a picture below to illustrate what I mean. I also then can't edit these new credentials meaning that I can't add any redirect URI.

Is there a way I can add the redirect URI to the automatically generated credentials? The problem now is that if I then run the setup function from the script as per the instructions, when I then try to open this link it gives me, I then get given the following message

Error 400: redirect_uri_mismatch

The redirect URI in the request, https://script.google.com/macros/d/12u2laknmO_9-zgxBbAX6wG9gJDUOvgJmYm5UquJsamShus9s5McrGBar/usercallback, does not match the ones authorized for the OAuth client. To update the authorized redirect URIs, visit: https://console.developers.google.com/apis/credentials/oauthclient/${your_client_id}?project=${your_project_number}