The SX1280Z3DSFGW1 is a 3 channel 2.4GHz gateway. afaik this kind of gateway is supported neither by TTN V2 nor by TTN V3 (TTS CE) yet. But I am not sure.
On the other hand, you can find this frequencies here already: GitHub - TheThingsNetwork/lorawan-frequency-plans: LoRaWAN Frequency Plans for The Things Stack
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