Can not use end device using AS923-2 in The Thing Stack

Yes, I think this is a problem. My end device has been set with AS923-2.The actual frequency it sends to the gateway is 921.4-921.6MHz. This frequency complies with the LoRa Alliance, Inc. specification for AS923-2. But on TNN I can’t find suitable option for AS923-2. The option Asia 920-923 on TNN is AS923-1. Does that mean I can’t use AS923-2 on TTN?
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