@J-3804, Thanks for posting in Q&A. Based as I know, if there's licenses available in our organization, you can assign license in Microsoft 365 admin center
Assign license In Microsoft Entra
https://learn.microsoft.com/en-us/entra/fundamentals/license-users-groups
Or do it via Intune:
From your description, it seems we are failed to assign the license, If yes, you can check the error message on the right top to get more information.
If there's any update, feel free to let us know.
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