I have a FT891 with a DR891 and using WSJT software on a Windows 11 machine. It receives and decodes correctly, time is spot on, but does not transmit the data. I’m monitoring it on an older receiver and using an Android app which decodes other stations perfectly. I can see my signal on the waterfall and it looks similar to others the app decodes but the app isn’t showing my data. Calling CQ at very low power levels, old reciever antenna is disconnected. Tried different sound card adjustments and level adjustments on the software. I can hear the tone and the warbling affect on the stand alone receiver.
As far as Digirig is concerned, you can confirm it sends out the expected audio by plugging in regular stereo headphones into the audio socket. You should hear the tones on the right side.
The rest would be the transceiver settings. Make sure you copy those from the setup tutorial.