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Thanks for the update...
Your comment below ...
I have observed in Windows when either fldigi can't find the audio service OR permission to access the "mic" is turned off, fldigi complains at startup. Not too long ago, it would actually hang, requiring the task manager to kill it. But that bug was fixed...I think in 2024...and now fldigi pops a message saying it can't find the audio device.

You write that the message appears to be sent, according to the fldigi TX pane, so fldigi must think it has a audio device and port to talk to.

That suggests either
the hardware is not handling the radio correctly or
the OS is not talking to the hardware (digirig) correctly.

You have indicated in the past that the digirig handles the radio, IIRC, so that leaves the possibility that the port is not configured correctly in the OS.

These are not definitive statements, but some ideas to kick around. I am not familiar with Mac OS, so no help there...

~R~