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Hi VIVEK KUMAR
Thank you for posting question to Microsoft Q&A Forum.
Did you also have any Office 365 license assigned to the targeted user?
What was the trial license you applied for?
Please check on this: https://learn.microsoft.com/en-us/microsoft-365/admin/manage/assign-licenses-to-users?view=o365-worldwide
It could be great if you could provide a screenshot of your licenses by going to Billing > Your products like this:
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