Rocket R5AC no network?

I bought a used Rocket R5AC-lite. I got the firmware flashed in the typical fashion with no issues. However it now does not DtD link with other nodes!
I have these devices, all have current firmware 3.24.10.0

• Mikrotik RB750UPr2 setup with a simple bridge on all ports. no filtering, NAT, vlan, nothing.
• Mikrotik hAP Ac lite
• GL.iNet GL-AR750
• the Rocket R5AC-lite in question

 

• The hAP and AR750 have DtD linked to each other, but neither one can "see" the R5AC. 
• The R5AC connects via RF to other nodes I have, so I can reach it that way

I can run Torch on the router, to watch traffic on port 5 (to/from the R5AC). there isn't much, but occasionally something pops in. How often and what should I expect to see from the R5AC?