MacOS 10.14, Mojave, introduces a further layer of checks which require apps to get user's approval before controlling the Mac from remote.

When NoMachine is installed on Mojave, the first time the user connects he/she will be requested to add the nxnode program in the Accessibility settings. If this is not accepted, the user will be not able to interact with the Mac in the NoMachine session.

Additionally, the user will be also requested to allow access to microphone and camera.

To avoid the dialogs popping up when the user connects, it's possible to configure system settings manually as explained here: https://www.nomachine.com/AR10P01001