On the GW itself or in the V3 console?
In the v3 console.
Ok what GW are you using, which concentrator board, which RF/baseband solution (SX130?), which packet forwarder? What is source of any libraries/firmware.
I use the ST LRWAN_GS_HF1(SX1301/SX1257) gateway extension board, with the original firmware.
That suggests your device is mis-configured
The gateway and the nodes was working properly with v2, and with an other gateway(Tracknet TabsHub) the v2 is still working perfectly, with the same nodes.
The gateway is receive all teh 8 channels. For example the 867.500MHz:
Full details on Node hardware and firmware/libraries please…inc sources where acquired and any changes you have made.
The nodes: The MCU is an atmega4809, and the LoRa module is a RFM92W(SX1272). I don’t use public libraries, because i made them. And this was working perfectly on the v2 with all the 8 channels.
This is the part of the node’s code, wich choose the tx channel:
This was working with the TTN V2!