If your source platform is Google Vault, you need to setup Google Console project before proceeding for migration. Follow below given steps to create a google console project:
Then Go to Admin Console and you will be redirected to the browser where you have to login using the source/destination admin email id .
Manage API client Access screen comes up, enter earlier created Unique Id (Prefer Step 10 in “Client Name” field and below given permissions in “One or More API Scopes” fields as shown below:
https://www.googleapis.com/auth/ediscovery,
https://www.googleapis.com/auth/devstorage.full_control,
https://www.googleapis.com/auth/admin.directory.user.readonly,
https://www.googleapis.com/auth/admin.directory.userschema.readonly,
https://www.googleapis.com/auth/admin.directory.rolemanagement.readonly
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