If your source or destination platform is G Suite, you need to setup Google Console project before proceeding for migration. Follow below given steps to create a google console project:
Go to the cloud platform https://console.developers.google.com/ and Sign in with any G Suite Admin ID.
Service account details screen would be displayed, then click on Keys tab in same page. After that click on Add key >> Create new key and Select an option P12 from key type and click on Create button:
After successful creation, Private Key will be downloaded in your computer (Save this file securely as it will require for migration). A message will prompt, “Private Key saved to your computer” click on Close:
Go to Google Admin Console at: https://admin.google.com/ and sign in with admin account:
"Add a new client ID" screen would be displayed, then enter earlier created Client ID (Prefer Step 10 from project creation steps) in “Client ID / Unique ID” field and add below given permissions in “OAuth Scopes(comma-delimited)” fields and click on Authorize button:
G Suite as a Source:Users
G Suite as a Destination:Users