Yes. As long as its not applied to another account.
Exchange Online License Issue
Can the purchased Exchange Online License for an email Id be reused for the same same email id being restored after 1 week of the id deletion?
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Joyce Shen - MSFT 16,641 Reputation points
2021-09-10T06:32:26.877+00:00 Yes you can, here is the official document which introduces about Unassign licenses from users and reassign the unused licenses to other users in detail for your reference.
And License removal
When an Exchange Online license is removed from a user, Exchange Online data associated with that account is held for 30 days. After the 30-day grace period, the data is deleted and can't be recovered. If you add the license back to the user during the grace period, this will restore access, and the mailbox will become fully active.
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