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Groups: Tenant to tenant migration
After a merge we are in the process of moving as much content as possible from one tenant to another. The process a moving a unified group looks easy. Evaluate which groups should be migrated (and...
Groups use special forms of mailboxes that not all migration tools even reveal let alone access... That is my warning.
Just as an example, try using the Get-Mailbox cmdlet to list group mailboxes. They don't exist. You have to use Get-UnifiedGroup. But you can feed a group mailbox id into Get-MailboxStatistics... So it's inconsistent, hence the warning.
Regarding Planner migration, please check the below thread.
https://techcommunity.microsoft.com/t5/Planner/Ability-to-migrate-Planner-content/m-p/40070#M474