Google Play Developer API - “The current user has insufficient permissions to perform the requested operation.”

Question

I have a Google dev console process with Google Play Developer API is enabled and the project is linked to Google Play project. In Google Dev console project, created OAuth

Answer 1

After adding a new user in the Google Play Console, Google needs up to 24 hours to propagate all access rights for all apis.

I ran into the same issue, when I've tried to using the oauth2 flow to access the Inapp purchases status api. It's not official documented, but this github comment helped me to figure this out.