When trying to run the Apply System Configuration Task in 8.1 RU7, the task will come back as successful but the Mac hasn't joined the domain.
***ExecuteClass:: Child Process returncode = 134
This is located under the DeployConfigTask.log on the client machine.
Deployment Solutions 8.1 RU7
Asctool binary was x86 and should have been updated to x64.
Fixed in 8.1 RU7 Post hotfix INFO5191 also fixed in 8.5 RU1.
You can manually join the machine using a run script task, or from the machine it self.
You can also use a this script to join the domain:
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#!/bin/sh
uname=%!UserName!%
upass='%!Password!%'
dsconfigad -add DOMAIN.COM -computer %COMPNAME% -username $uname -password $upass -force
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Change out DOMAIN.COM with your domain information.