LR8 Knot with 1nce card on NB-IoT. Im lost...

Hi There!
I have used several mikrotik lora LR8 gateways back in the days, but for this time I have bought a KNOT LR8 bought gw with SIM card adapter. In this project we need to connect to NB-IoT network using a 1nce card, which seems to be pretty common.
I haven’t found any valid documentation on this, it seems not many people are doing this? The few pages I found related to this skip some steps so I get lost on them.
Can anyone provide a basic step by step guide on how to do this?
I have ENABLED ppp-out1, following some forums I changed both channels from 0 to 2, but it gave an error about channel 2…so its back to channel 0 on both
My card doesn’t have a PIN enabled so this is not the issue
Also I added the correct APN (iot.1nce.net) with no change
The ppp-out interface shows R (running, enabled), but if I disconnect the ethernet cable, I lose connection to internet, I was expecting to switch from ethernet to ppp connection, but for some reason nothing goes out from then on
Also I find some common modem commands (AT+…) that I’ve used many times in the days on serial modems, but I don’t see how to issue them on this gateway

Any help will be much appreciated!
Thanks

Ok I somehow managed to make it work, kinda…
I set:
Port=modem
Data Channel=2
Info Channel=0
Dial on Demand=NO

This made at least the gateway appear on my Chirpstack server as ONLINE, although a PING command from inside the gateway would only show 2 succesful packets and hundreds of lost packets

This worked at 10pm but today I checked and my chirpstack server showed Gateway Offline, last seen at 2am…
I got back to the gateway and the config is kept, but got thousands of lines in the log saying Lora. Can’t resolve xxxx (my chirpstack DNS)

I rebooted the gateway, and nothing changed…

Any idea?
Thanks