I made some teste with local accounts and domain account, everytime with full administrytive right on the server.
Everytime i got this error, unless im using the "Local System Account". When im logged in and execute the task with "" this seems to work fine.
There are no errors in the eventlog. On the SMP is only this message:
Task instance is completed: 'Run TA_DomainAccountTest' (a5c0cdec-7d30-4794-8d73-cd349edc68ba, fc4be919-b44c-4203-804f-4f9f6d127429), started at 06.12.2016 12:22:30, status=Failed, total time=00:00:24.0622894
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Date: 06.12.2016 12:22:54, Tick Count: 1619651187 (18.17:54:11.1870000), Host Name: <SMPName>, Size: 443 B
Process: AtrsHost (6784), Thread ID: 1381, Module: AtrsHost.exe
Priority: 4, Source: ServerTaskExecutionInstance
File: C:\ProgramData\Symantec\SMP\Logs\a.log