Cannot create login on cluster I have a SQL Server 2008 R2 cluster on Win2008 R2. 

I am unable to add a login for the service account. 

Any other login I add to this instance works fine and I have been able to add the same service account login to numerous other SQL instances. 

Moving the instance to other node does not resolve the issue. 

when I run

 CREATE LOGIN [DOMAIN\ServiceAccount] FROM windows; 


I get the error

Msg 15401, Level 16, State 1, Line 1
Windows NT user or group 'DOMAIN\ServiceAccount' not found. 
    Check the name again. 


When I run 

exec xp_logininfo 'DOMAIN\ServiceAccount', 'all'; 


I get the error

Msg 15404, Level 16, State 11, Procedure xp_logininfo, Line 62
Could not obtain information about Windows NT group/user 
    'DOMAIN\ServiceAccount', error code 0xffff0002. 


Any suggestions would be appreciated.
Is the service account a domain account?  Sounds to me like the service account may in fact be an account that is local to the machine, not a domain account.  

Try:

CREATE LOGIN [WINDOWS_MACHINE_NAME\ServiceAccount] FROM windows; 


If this works, the account is not a domain account.