The frequencies look right, byte order looks right for MCCI-Catena, check your antenna of course. It’s really difficult to get something working for the first time in isolation (I’ve been where you are) where not much is known good, but at least you have the gateways surrounding you. If you have two of these then installing some LoRa sketches (for peer-to-peer comms) would help validate your hardware.
Can you try using ABP (instead of OTAA) as this takes one component (your device receiving a downlink) out of the equation?