When working with either a point to point or point to multipoint setup we need to configure one unit as the root unit and the other unit(s) as the non root, we need to set the same SSID on all the units, the SSID can be broadcasted or not(it is not required), we need to set the units with the same security encryption method, set on the root the channel to use and distance.
Then you will need to make sure that the units have been aligned one to the other, there is no objects of obstruction and a clear line of sight.
Here is a configuration example of a unit set as root using the 2.4ghz radio, broadcasting the SSID and using WPA version 2 with AES and PSK.
The PSK is cisco12345 and the non root configuration should be the same only set as station role non root.
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
enable secret 5 $1$cKgH$g4f9xkwWa.9/iwEE9yz590
no aaa new-model
dot11 ssid TEST