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You must check in your local policies <i>User Rights Assignment</i> at Administrative Tools / Local Security Policy / Local Policies &nbsp;and manually remove the deleted account.<br />
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Best regards
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I have looked though all the Local Security Policy's and SQLAgent$SQLEXPRESS doesn't appear in any. There are a lot of entries begining with S-1-5-80- and a long string of numbers , could it be one of these?<br />
Thanks
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When an account or group is deleted the object no longer exists thats why you see the UID.<br />
And yes is one of these.<br />
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Also check all GPO's until you deleted all unknown references.<br />
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Best regards
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Is there any way to identify which
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I have checked the entries with psgetsid and they don't relate to SQLAgent$SQLEXPRESS
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Spot on, it was in the Default Domain Controllers Policy <br />
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Thanks
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I have just installed a new Domain Controller running windows Server 2012 R2, I am getting plagued by Event 1202 warnings Security policies were propagated with warning. 0x534 : No mapping between account names and security IDs was done <br />
I have identified the account causing the issue, its SQLAgent$SQLEXPRESS. The problem is this is an account that was on the old server and no longer exists on the new one as we don’t have this instance of SQL.<br />
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In RSOP its showing as been used in <br />
<br />
Adjust memory quotas for process<br />
Bypass traverse checking<br />
Replace a process level token<br />
<br />
But when I look in the local security police it’s not in any of these, I have tried installing that instance of SQL and removing it but I am still getting the warning every few minutes
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I have just installed a new Domain Controller running windows Server 2012 R2, I am getting plagued by Event 1202 warnings Security policies were propagated with warning. 0x534 : No mapping between account names and security IDs was done 
I have identified the account causing the issue, its SQLAgent$SQLEXPRESS. The problem is this is an account that was on the old server and no longer exists on the new one as we don’t have this instance of SQL.

In RSOP its showing as been used in 

Adjust memory quotas for process
Bypass traverse checking
Replace a process level token

But when I look in the local security police it’s not in any of these, I have tried installing that instance of SQL and removing it but I am still getting the warning every few minutes

Security policies were propagated with warning. 0x534 : No mapping between account names and security IDs was done.

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.