This article describes the prerequisites of the Google to Office 365 migration.

Prerequisites

Make sure that you have an administrator account in both environments (Google Apps and Office 365).
Make sure that your Office 365 tenant is up and running.

Google Configuration

Google data migration does not require user credentials (user passwords).
However, it does require you to setup a service account that has access to all data.
Cloudiway uses this service account to access the Google Drives of your users.
See this article to create a service account in Google and give it the necessary permissions.

Office 365 Configuration

Cloudiway automatically creates OneDrive profiles and assigns permissions to the migration account during the pre processing task.
See:
http://kb.cloudiway.com/create-an-administrator-account-for-onedrive-migration/

However, for your initial testing, it’s also possible to manually set the required permissions.
See http://kb.cloudiway.com/manually-set-permissions-for-an-administrator-account-in-onedrive/