It is important for the Google Apps Admin to activate the Google API for Collavate to sync and update G Suite users. Note that only a Google Apps / G Suite Admin has access to enabling this feature in the Google Admin Console.
Here is how to Activate your Google API:
1. Google Apps Administrator can either go directly to Google Admin Console, or click the Admin icon in the Google Apps grid.
2. Log in and click the "Security" icon in the Admin Console
3. Click the “API Reference” and check “Enable API access”
Once the "Enable API access" box is checked, you can continue to Collavate and smoothly sync your G Suite users.