I am configuring the build definition in Visual Studio Team Services using the build agent installed on my local machine for testing.
I follow these instructions to create an assembly agent, configure the assembly definition, and the queue in the assembly. I created an agent on my local computer and appears in the agent pool in VSTS. The agent is on and ready to go. I also created an assembly definition that calls my build script. Everything until this moment is working fine.
At this point, I am ready to queue the assembly and start it. The dialog for this looks like this:

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UPDATE
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