Unattended bot - Error (There is a user session on the target machine).

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Posted on by pmota

Hi everyone,

Imagine the following scenario.

1. I have a Windows Server where I have installed the Machine runtime app.

2. I set up the machine using a service account on the server. I will call it serviceaccount@contoso.com

3. I have a per-user plan premium license + the RPA add-on attached to the serviceaccount@contoso.com

4. After having my service account set up, I created my flow in the cloud, and selected the Unattended mode (I was logged in in the cloud using the same serviceaccount@contoso.com); however, I got the error below:

"No machine able to run the desktop flow has been found. Aborting execution. Error encountered when connecting to machines: There is a user session on the target machine. Cannot execute unattended desktop flow."

Then, I went back to the server, and I set up a new machine using my own credentials. For reference I will call it pmota@contoso.com and the previous flow worked in the cloud.

However, I do not have premium account. It does not make sense to me having two premium accounts to run an unattended flow. What am I doing wrong? I double-checked and ensured I had all the sessions logged-out in the server.

Any help will be much appreciated.

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Power Automate Desktop

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Agnius Bartninkas Most Valuable Professional on at

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If you want to run it in unattended mode, the user must not be logged in to the account when you run the flow. If it is a normal Windows machine, no user sessions can be active. If it is a Windows Server machine that supports parallel user sessions, the specific user that you use for launching the desktop flow (as set up in the Desktop flows connection in the cloud) must be logged off.

That's the general idea of an unattended flow - it cannot take over an active user session, nor can it terminate it. The user must be signed out when the unattended flow is to run. If you want to run it while the user is signed in, you should run it in attended mode.

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pmota 55 on at

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Hi @Agnius ,

Thank you for your response.

After so much struggle, I figured out what the issue was. When creating the machine, the toggle to reuse sessions needs to be turned on.
By doing this, the secondary account was not necessary (Which makes more sense).

More information can be found on the link below:
https://learn.microsoft.com/en-us/power-automate/desktop-flows/run-unattended-desktop-flows

Thank you,

Paulo

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