If you use a tool called Avecto" https://www.avecto.com/ for privilege elevation, it stops the ability to install\uninstall DLP agents.
In order to successfully install the endpoint agents, the proper rights are needed on the machines or the agent will either fail to install or not install correctly.
Without the proper rights, you will also face issues with agent uninstalls and stopping or starting the edpa and wdp services.
If Avecto can elevate your user privileges to the system level; such as SCCM does; it should work.
Using SCCM to deploy endpoint agents works as it essentially elevates the user to System User