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Silent join machine group fails

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Posted on by mgreen1066

I am trying to register a machine each day and have it join a machine group using PAD.MachineRegistration.Silent.exe it will work a few times on the day the group is created but then fails. Registration of the machine works every time the issue is only with joining the machine group

The command I am trying is

$machineGroupPassword | .\PAD.MachineRegistration.Silent.exe -joinmachinegroup -groupid $machineGroupId -grouppassword -tenantid $tenantid -environmentid $environmentId

I get an error

AuthenticationFailed
Failed to acquire token silently. You can retry with a fallback mechanism. See -help above.
Error code: parsing_wstrust_response_failed. Error message: There was an error parsing WS-Trust response from the endpoint.

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Power Automate Desktop

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fraenK 2,125 on at

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Did you follow this? How do you handle the secure input?

Grouppassword: the password of your machine. If this is the first machine of the group, you need to define it. If not, you need to provide the defined password of the group. This input isn’t expected to be specified as an input of the command line. See “Secure input” section to see options you can choose to provide it

https://docs.microsoft.com/en-us/power-automate/desktop-flows/machines-silent-registration#join-silently-a-machine-group
rkumar311 2 on at

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@mgreen1066 Did you get any solution to this issue ? I am facing same during PA Silent Registration.
JimiBest 12 on at

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Looks like you need to authenticate somehow... how did you register the machine? Did you use Service Principal/Azure App authentication or certificate based machine authentication?
mgreen1066 2 on at

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I did manage to get this sorted by running the below script. only issue is the group has a limit of 50 machines. So some manual interaction is needed when that limit is reached

Start-Transcript "$env:temp\powerautomatereg.txt"
$environmentId = ""
$machineGroupId = ""
$machineGroupPassword = ""
$tenantid = ""
$applicationid = ""
$password = ""
#line break is required! these two bits needs tobe concated together
$machinesecrets = "$machineGroupPassword
$password"
Set-Location "C:\Program Files (x86)\Power Automate Desktop"
$password | .\PAD.MachineRegistration.Silent.exe -register -force -applicationid $applicationid -clientsecret -tenantid $tenantid -environmentid $environmentId

$machinesecrets | .\PAD.MachineRegistration.Silent.exe -joinmachinegroup -groupid $machineGroupId -grouppassword -applicationid $applicationid -clientsecret -tenantid $tenantid -environmentid $environmentId

stop-transcript