Could not drop login 'loginname' as the user is currently logged in.

 I  go the below error in one our environments.



Below are the troubleshooting steps. Run the below command find the session id that are using by that particular session KILL all the session KILL 
SELECT session_id
FROM sys.dm_exec_sessions
WHERE login_name = 'LoginName'
And then run the below command 
USE [master]
GO
DROP LOGIN [LoginName]

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