Google authorisation – invalid_scope

Whenever I try you authorise the link to Google Drive, I get:

Error: invalid_scope
You don’t have permission to access some scopes. Your project is trying to access scopes that need to go through the verification process. {invalid = [https://www.googleapis.com/auth/drive]} If you need to use one of these scopes, submit a verification request.
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Request Details
client_id=”xxx”.apps.googleusercontent.com
That’s all we know.

Having followed the instructions quite meticulously, I’m at a loss what could be causing this.