Exchange CU11 Install Issue

TLDR: SystemMailbox{8cc370d3-822a-4ab8-a926-bb94bd0641a9}

Error:
The following error was generated when “$error.Clear();
$auditLogMbxName = “SystemMailbox{8cc370d3-822a-4ab8-a926-bb94bd0641a9}”;
$auditLogMbxLastName = “SystemMailbox 8cc370d3-822a-4ab8-a926-bb94bd0641a9”;
Write-ExchangeSetupLog -Info (“Retrieving users with LastName=$auditLogMbxLastName.”);
$auditLogUser = @(Get-User -Filter {LastName -eq $auditLogMbxLastName} -IgnoreDefaultScope -ResultSize 1);
if ($auditLogUser.Length -eq 0)
{
Write-ExchangeSetupLog -Info (“Retrieving audit log users with LastName=$auditLogMbxLastName.”);
$auditLogUser = @(Get-User -AuditLog -Filter {LastName -eq $auditLogMbxLastName} -IgnoreDefaultScope -ResultSize 1);
}

if ($auditLogUser.Length -eq 0)
{
Write-ExchangeSetupLog -Info (“Installing user account with Name=$auditLogMbxName and LastName=$auditLogMbxLastName.”);
Install-UserAccount -Name $auditLogMbxName -LastName $auditLogMbxLastName;
}
else
{
Write-ExchangeSetupLog -Info (“Audit log user $auditLogMbxName already exists.”);
}
” was run: “Microsoft.Exchange.Data.Directory.ADConstraintViolationException: An Active Directory Constraint Violation error occurred on NCGADC2.ncga.state.nc.us. Additional information: The operation failed because UPN value provided for addition/modification is not unique forest-wide.
Active directory response: 000021C8: AtrErr: DSID-03200BD2, #1:
0: 000021C8: DSID-03200BD2, problem 1005 (CONSTRAINT_ATT_TYPE), data 0, Att 90290 (userPrincipalName)
—> System.DirectoryServices.Protocols.DirectoryOperationException: A value in the request is invalid.
at System.DirectoryServices.Protocols.LdapConnection.ConstructResponse(Int32 messageId, LdapOperation operation, ResultAll resultType, TimeSpan requestTimeOut, Boolean exceptionOnTimeOut)
at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request, TimeSpan requestTimeout)
at Microsoft.Exchange.Data.Directory.GuardedDirectoryExecution.Execute[T](String bucketName, Func`1 action, Int64& concurrency)
at Microsoft.Exchange.Data.Directory.PooledLdapConnection.GuardedSendRequest(String forestName, GuardedDirectoryExecution guardedDirectoryExecution, DirectoryRequest request, TimeSpan timeout, Func`3 sendRequestDelegate, Int64& concurrency)
at Microsoft.Exchange.Data.Directory.PooledLdapConnection.SendRequest(DirectoryRequest request, LdapOperation ldapOperation, Nullable`1 clientSideSearchTimeout, IADLogContext logContext, Boolean shouldLogLastFilter)
at Microsoft.Exchange.Data.Directory.ADDataSession.ExecuteModificationRequest(ADObject entry, DirectoryRequest request, ADObjectId originalId, Boolean emptyObjectSessionOnException, Boolean isSync)
— End of inner exception stack trace —
at Microsoft.Exchange.Data.Directory.ADDataSession.AnalyzeDirectoryError(PooledLdapConnection connection, DirectoryRequest request, DirectoryException de, Int32 totalRetries, Int32 retriesOnServer, String callerFilePath, Int32 callerFileLine, String memberName)
at Microsoft.Exchange.Data.Directory.ADDataSession.ExecuteModificationRequest(ADObject entry, DirectoryRequest request, ADObjectId originalId, Boolean emptyObjectSessionOnException, Boolean isSync)
at Microsoft.Exchange.Data.Directory.ADDataSession.Save(ADObject instanceToSave, IEnumerable`1 properties, Boolean bypassValidation)
at Microsoft.Exchange.Data.Directory.Recipient.ADRecipientObjectSession.Save(ADRecipient instanceToSave, String callerFilePath, Int32 callerFileLine, String memberName)
at Microsoft.Exchange.Management.Deployment.InstallUserAccount.InternalProcessRecord()
at Microsoft.Exchange.Configuration.Tasks.Task.b__91_1()
at Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)”.