Hello,
First I would recommend to run the Get-Migration for all users in the batch as it can provide more details. For example:
Get-MigrationUser -ResultSize Unlimited -BatchId "<yourID>" | ft -AutoSize
In general, I would recommend to check the next tree of information of Microsoft articles in order to check prerequisites list, migration batch creation and completions, etc:
https://learn.microsoft.com/en-us/exchange/mailbox-migration/perform-g-suite-migration
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