Action: Add your Office 365 default tenant routing domain to Google - For successful mail flow to occur between Office 365 ...

Action: Add your Office 365 default tenant routing domain to Google - For successful mail flow to occur between Office 365 and G Suite during migration, you must add your onmicrosoft.com default domain (for example, contoso.onmicrosoft.com) to the G Suite environment. We recommend you add the domain as another domain instead of a domain alias.