need support about how to communicate two networks over a Radio Backbone.
the scheme is something like that…

so, I have a Router in Region A in trunk with a Mikrotik. They have an OSPF Process.
Mikrotik region A and Mikrotik Region B has an OSPF Process where Mikrotik B announces its addresses in VLAN 121, Router ID, Back to Back address (vlan125) and its Public IP.
In Router A i can see all the routes, but i cant make ping to Router ID (172.21.3.4) and gateway of the VLAN 121 (172.21.31.254). Public IP and B2B response.
I make the same over a wired network lab (i put off the ubiquiti and connect an UTP wire) and i can make ping to all the interfaces.
what could be the problem?..