Hello Aashish,
Welcome to Atlassian Community!
When a user is deactivated, to activate the account again it's necessary to go to Administration > Users. On this page, you can see all active and inactive users and you can filter by "No site access" or search by name to be easier to find.
Once you find the desired user, click on "Grant site access":
Hope this helps!
Regards,
Angélica
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