Error migrating email attachments between CRM Systems

Getting the following when attempting to migrate attachments between two Dynamics 365 CRM systems. I can see the attachment when I preview the query so I know it does exist. The Activityid's are the same between systems. I migrated the Emails, then activity party and now I'm trying attachments with no luck.

 

Error in calling Operation Update: Operation failed. Label: Update/Insert activitymimeattachment, Name: activitymimeattachmentUpdateInsert, Message: -2147220969:attachment With Id = xxxxx Does Not Exist (guid removed)

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