Account user Deactivated - Need Reactive but can't showing button Reactive

[Mario]

Hi Team, 

I have a problem some of account user Deactivated i wan solved this issue but i check the button Reactive it's not showing in Jira. Need advice for the solution so i can resolved this issue. I need immediately to fix. Thanks for Help. 

Mario.

[Rick Westbrock]

Have you tried the Activate a user API? Link to documentation is https://developer.atlassian.com/cloud/admin/user-management/rest/api-group-lifecycle/#api-users-account-id-manage-lifecycle-enable-post