…for which TTN may be using the other gateway for the Join Accept, if that gateway has a better reception of its Join Request…
If the Lorix One gateway is NOT single channel, then maybe somehow TTN still thinks it cannot do downlinks? Like maybe it’s not pulling for commands at all? (Again, I’d guess TTN would select the other gateway then as that also received the RN2483’s Join Request, but maybe there’s a bug there?)
As an aside: having multiple gateways in the same network should be fine: 2 gateways behind 1 router / port 1700?