In your migration log for your Google Groups migration, you see the message: “Fatal error during migration process: Initialization of Office 365 Unified ‘(Target Group name)’ Group Failed : You can’t use the domain because it’s not an accepted domain for your organization”.
The Target name you entered for the group, shown the Group List view, accepts a group name or an email address at the target domain. Any domain you use must already be set up on the target.
Go to the Group List view on the Cloudiway platform, then find the group in question and click on it to edit. Update the Target name field to either a simple name or a valid email address for the target, and restart your migration.