Diagnosis
This usually means the mesh point has a poor wireless 'backhaul' connection to the main router. It's struggling to talk to the base, so it has nothing strong to rebroadcast to your devices.
How to Fix It
Reposition the mesh point. It needs a strong signal from the main unit where it sits. 1) In the AmpliFi app, tap on the mesh point. Look at the 'Connection' quality. It should say 'Great' or 'Good'. 2) If it says 'Fair' or 'Poor', unplug it and move it closer to the main router, preferably with a clear line of sight (not inside a cabinet or behind a big metal appliance). 3) Plug it back in and give it a few minutes to re-evaluate the connection. Check the app again. A better location is almost always the fix.
If That Didn't Work
Consider using an Ethernet cable. The Alien Mesh Point has two Ethernet ports. You can run a long cable from the main router to the mesh point, plug it in, and in the app, set its 'Connection Preference' to 'Ethernet'. This gives you a rock-solid, full-speed backhaul and turns the mesh point into a true wired access point.
Heads Up
The mesh point isn't a magic signal booster. It needs to receive a good signal to give one out. Think of it as a middleman—if the middleman can't hear the boss, he can't relay the message clearly.