After purchasing the licenses, make sure to assign them to the users who need them:
Use the Microsoft 365 admin center to assign licenses to individual users or small sets of users at a time.
You assign licenses on the Licenses page (for up to 20 users at a time) or the Active users page (for up to 40 users at a time). The method you choose depends on whether you want to manage product licenses for specific users or manage user licenses for specific products.
For step-by-step instructions, see Assign licenses to users.
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