Cannot delete resource group

I tried to delete one of my resource groups - it gave issues , no idea why.

Failed to delete resource group ResourceMoverRG-australiaeast-eastus-eus2: Deletion of resource group 'ResourceMoverRG-australiaeast-eastus-eus2' failed as resources with identifiers 'Microsoft.Migrate/moveCollections/MoveCollection-ae-eus-eus2' could not be deleted. The provisioning state of the resource group will be rolled back. The tracking Id is 'cb18f76e-2d11-4ccf-8539-b03b2ca3f8b5'. Please check audit logs for more details. (Code: ResourceGroupDeletionBlocked) Deletion of move collection is not allowed when there are move resources present in it.
      Possible Causes: The move collection has move resources present in it.
      Recommended Action: In Portal open 'Azure Resource Mover' > Across regions > Select SubscriptionId: 4a76c3bf-bc77-49d8-95e6-8e5a5795d215, Source Region: australiaeast, Target Region: eastus > delete all the resources, and then retry deleting the Resource group.
      For PowerShell please use remove resource cmdlet and delete all resources and then try deleting move collection or resource group. Please follow documentation  https://go.microsoft.com/fwlink/?linkid=2145903.
     (Code: DeleteCollectionFailedResourcesExists, Target: /subscriptions/4a76c3bf-bc77-49d8-95e6-8e5a5795d215/resourceGroups/ResourceMoverRG-australiaeast-eastus-eus2/providers/Microsoft.Migrate/moveCollections/MoveCollection-ae-eus-eus2)