I have the same issue here. NoMachine version 7.1.3 on MacOS Catalina 10.15.7.
Console gives an error when launching the application:
'.SF NS Mono'"{ID: com.nomachine.nxdock, PID[18852], auid: 1466994070, euid: 1466994070, binary path: '/Applications/NoMachine.app/Contents/MacOS/nxdock'} attempted to call TCCAccessRequest without the com.apple.private.tcc.manager.check-by-audit-token entitlement'