According to the documentation: https://developers.google.com/admin-sdk/alertcenter/reference/rest/v1beta1/TopLevel/getSettings#authorization-scopes
And Also the discovery Documents: https://alertcenter.googleapis.com/$discovery/rest?version=v1beta1
The scope for "Alert Center API" is https://www.googleapis.com/auth/apps.alerts
However, when I use this scope, I get the error message:
Authorization Error
Error 400: invalid_scope
Some requested scopes cannot be shown: [https://www.googleapis.com/auth/apps.alerts]
Did the scope change and the documentation is outdated? Any other options to access this API?
This response is happening because you are not using the scope with a service account. As described by this piece of documentation:
Your project must use a service account when accessing the API.
Therefore, if you access this API with a service account you will be able to interface it correctly, otherwise, you won't. More about service account authorization here.
Also, note that the scope is in the list under G Suite Alert Center API v1beta1.