DL Migration fails because of duplicate recipients

[daimhin]

I have been working on doing my first migration and setup a test group that mirrors one of my production groups. When I ran the migration command, it built the group in Exchange Online, but it threw an error on two entries and logged the migration as failed. The log entries I got for one of the users is:

[4/25/2024 5:04:41 PM] - =====
[4/25/2024 5:04:41 PM] - Post Create Errors:
[4/25/2024 5:04:41 PM] - Primary Email Address or UPN: [email protected]
[4/25/2024 5:04:41 PM] - External Directory Object ID: d9f2b055-9f61-4120-8dc1-6257687e3fc4
[4/25/2024 5:04:41 PM] - Name: AHC_TEA_TEST
[4/25/2024 5:04:41 PM] - Alias: AHC_TEA_TEST
[4/25/2024 5:04:41 PM] - Attribute in Error: Cloud Distribution Group Member
[4/25/2024 5:04:41 PM] - Error Message: Member [email protected] unable to add to cloud distribution group.  Manual addition required.
[4/25/2024 5:04:41 PM] - Error Message Details: Ex8155FB|Microsoft.Exchange.Configuration.Tasks.ManagementObjectAmbiguousException|There are multiple recipients matching the identity "[email protected]". Please specify a unique value.
[4/25/2024 5:04:41 PM] - =====

The two errors were for cross-forest contacts that had been added to the group. I thought this might be the issue, but there is a third cross-forest contact in the group that migrated correctly. These contacts have been synced to the tenant and are available there as a contact. When I ran the Get-Recipient cmdlet for the email address it returns two results. One is the contact, but the other is a guest account where the user has been invited into a team in the tenant.

Name                                 RecipientType
----                                 -------------
username_domain.com#EXT#             MailUser
d80e7381-4895-4d0e-9803-b099fa26c792 MailContact

I can manually add the user to the migrated group afterwards, but would like to figure out if there is any way to resolve this during the migration process.