We are announcing the End of Life (EOL) of the optional PDQ Agent beta from our existing products. See this blog post for more information https://www.pdq.com/blog/pdq-agent-status-update/
You receive an error "AdminArsenal.PDQInventory.Agent.AgentOperationNotSupportedException" while attempting PDQ Inventory operations on a target computer with the agent installed AND is external to your PDQ Inventory server.
Remote commands, and the processes processes window are not yet supported by the Inventory agent external to your PDQ server. Please re-run the commands, or view the processes when the target machine has direct connectivity to your PDQ Inventory Server.