MDT 2013, failed to join domain with error " The account *may* already exist in a different OU "

I used MDT 2012 for deployment of Windows 7 for several years. Now I am in a new company, set up MDT 2013/ADK to deploy Windows 7. I would like to say " MDT 2013 is rubbish for Windows 7". mayb it's perfect for Windows 8/10. I usually get failed to join domain with error " The account *may* already exist in a different OU " in MDT process. Checked the logs, error is 0x54b, which means no such domain. It's bullshit, I can join domain manually any time. AND, sometimes can join domain successfully.

I think it should be a bug of MDT 2013. Will go back to MDT 2012.

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54:484 NetpDoDomainJoin
07/08/2015 17:52:54:484 NetpMachineValidToJoin: 'MDT-4'
07/08/2015 17:52:54:484  OS Version: 6.1
07/08/2015 17:52:54:484  Build number: 7601 (7601.win7sp1_gdr.130828-1532)
07/08/2015 17:52:54:484  ServicePack: Service Pack 1
07/08/2015 17:52:54:500  SKU: Windows 7 Professional
07/08/2015 17:52:54:500 NetpDomainJoinLicensingCheck: ulLicenseValue=1, Status: 0x0
07/08/2015 17:52:54:500 NetpGetLsaPrimaryDomain: status: 0x0
07/08/2015 17:52:54:500 NetpMachineValidToJoin: status: 0x0
07/08/2015 17:52:54:500 NetpJoinDomain
07/08/2015 17:52:54:500  Machine: MDT-4
07/08/2015 17:52:54:500  Domain: domain
07/08/2015 17:52:54:500  MachineAccountOU: OU=CorpComputer,OU=City,OU=Desktops,DC=domain
07/08/2015 17:52:54:500  Account: domain\April
07/08/2015 17:52:54:500  Options: 0x3
07/08/2015 17:52:54:500 NetpLoadParameters: loading registry parameters...
07/08/2015 17:52:54:500 NetpLoadParameters: DNSNameResolutionRequired not found, defaulting to '1' 0x2
07/08/2015 17:52:54:500 NetpLoadParameters: DomainCompatibilityMode not found, defaulting to '0' 0x2
07/08/2015 17:52:54:500 NetpLoadParameters: status: 0x2
07/08/2015 17:52:54:500 NetpValidateName: checking to see if 'domain' is valid as type 3 name
07/08/2015 17:53:09:507 NetpCheckDomainNameIsValid for domain returned 0x54b, last error is 0x0
07/08/2015 17:53:09:507 NetpCheckDomainNameIsValid [ Exists ] for 'domain' returned 0x54b
07/08/2015 17:53:09:507 NetpJoinDomainOnDs: Domain name is invalid, NetpValidateName returned: 0x54b
07/08/2015 17:53:09:507 NetpJoinDomainOnDs: Function exits with status of: 0x54b
07/08/2015 17:53:09:507 NetpDoDomainJoin: status: 0x54b
07/08/2015 17:53:09:523 ---------------------------------------------------------