We fixed a bug that could give you the error, Failed to create mail message. Nullable object must have a value when copying messages without proper send or receive date and time data with Copy mailboxes. This could happen if your message was previously migrated from another system.

We resolved an issue where the Message history tab in the destination Team could display an error message stating “Something went wrong” instead of loading your messages correctly when copying over 10 messages with Copy teams.

Users without a display name will no longer cause the mapping screen to fail with Copy mailboxes.

We fixed a bug that wouldn't display the correct amount of items copied with warnings in the Copy mailboxes migration report's summary screen.

The app no longer tries to perform infinite retries when getting 503 Service unavailable errors from Microsoft with Copy mailboxes.