Google Auth Platform OAuth configuration fails with tracking number

Hello,

I am trying to configure Google Auth Platform for a personal Google Cloud project named “YouTube Upload Helper”.

The project has Google Sheets API, Google Drive API, and YouTube Data API v3 enabled.
I completed App Information, selected External audience, entered Contact Information, and accepted the Google API Services User Data Policy.

However, creating the OAuth configuration fails with this message:
“An error occurred while creating the OAuth configuration. Please try again.”

No OAuth client is created.

Tracking number: (PII Removed by Staff)
Project ID: (PII Removed by Staff)

Could you please check why the OAuth configuration cannot be saved?

Thank you.