Unable to create DDC Login manually (DDC login already exists)

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Note :- Backup your Database before running any of the commands specified below

- Under Database > Logins > DDCs logins were not present.
- By trying to manually create the logins for DDC  it errors out  "Logins for DDC1 already existed "
- Delete the user with the login name from site,monitor,logging DB.
- Delete the Login under the security node of the SQL server. (if there is mirroring enabled do this on both the SQL servers)

- Run the below query to create the login.

USE [master] 
GO 
CREATE LOGIN [Domain\LoginName] FROM WINDOWS WITH DEFAULT_DATABASE=[master] 
GO  

 

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Problem Cause

DDC logins exists with wrong SID

https://social.msdn.microsoft.com/Forums/sqlserver/en-US/b2da235e-023f-4b2d-ab3b-6a4dad4069b6/sql-login-using-a-computer-account?forum=sqlsecurity