Hi,
a useful guide to follow for connecting to machines on the same LAN is here https://www.nomachine.com/getting-started-with-nomachine. To connect from a device to your Mac using its local IP address, both those devices must be on the same LAN.
But let’s check that everything is configured correctly. On the Mac, open NoMachine > Server Settings > Ports, and make sure that the “Advertise this computer on the local network” box is enabled. In Server Status is the server showing as ‘running’?
How are you connecting? Are you creating the connection manually or are you using an MDNS connection? By MDNS I’m referring to the computer icon with a little pipe that appears when you open the app on one of your mobile devices (scroll to the bottom of this guide for an example of what it looks like, thttps://www.nomachine.com/finding-other-nomachine-computers-on-the-same-network).
Could you firewall be blocking ports that NoMachine uses?