auto-youtube-subscription-playlist-2: Cannot update playlist for brand account using personal account

I followed the instructions, but couldn’t execute the second step completely:

2. Allow the Sheets to access Youtube:
  * Then, Google Developers Console / Youtube Data API / Enable API, close the tab, go back to Script Editor and click OK

I can’t find any Google Developers Console in the Resources / Advanced Google Services dialog. According to https://developers.google.com/apps-script/guides/services/advanced#enabling_advanced_services that option is available for a standard GCP project (or an older default GCP project that was created prior to April 8, 2019).

Nonetheless I tried to “Update Playlists” in the sheet document and this is the error message in the debug sheet:

Mon Oct 28 16:19:57 EET 2019 Couldn’t update playlist with video (5Aq7jyS8AAU), ERROR: Beim API-Aufruf von “youtube.playlistItems.insert” ist dieser Fehler aufgetreten: Forbidden

Sorry for the German log message. It means something like Couldn't update playlist with video (5Aq7jyS8AAU), ERROR: The following error occured at api call "youtube.playlistItems.insert": Forbidden

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Not sure if this is helpful, but it turned out to be really easy to just move my YouTube brand account to a personal Google. Then the script worked great (minus hitting my quota). Thanks for making this tool.

YouTube Help: Move your YouTube channel to another account