In order to enable Saasuma to access your Google Workspace Gmail and Contacts, you should enable two APIs:
1. Gmail API
2. Google People API
Once you’re logged into your Google Workspace Project, please use this link for quick access to the API Library page: https://console.developers.google.com/apis/library
On that page, you should find and enable two above mentioned APIs.
You should be able to see that API is enabled: