Why am I being asked for another license to resubmit?
Follow the instructions below according to your situation.
My previous migration failed and I want to resubmit:
We do not consume licenses for failed migrations. If a migration fails (or is stopped), we automatically restore any used license to your account. And when you resubmit for migration again, we simply debit the license we just restored.
My previous migration succeeded and I want to resubmit:
When using a mailbox migration license, no new license will be debited when you resubmit. This is because mailbox migration licenses allow up to 10 successful passes per mailbox.