Does holybro Pixhawk 6c mini support RFD900A?

I got a holybro pixhawk 6c mini recently. I tried to connect a RFD900A telemetry radio to its telem1 port. The led of the RFD900A has only blinked for a while and turned off.

However, the same RFD900A can be used on the telem1 port of a holybro pixhawk 6c properly.

I have no idea why it is not working with the holybro pixhawk 6c mini.

Does anyone get it work with any telemetry radio before?