The Mac can take audio from your iPad, but nothing on the Mac is listening to it yet.
On the Mac, open the dictation app you use and set its input device to SOME
Desk Mic — in Wispr Flow, in Superwhisper, or in System Settings →
Sound → Input if you want everything on the Mac to use it. SOME Desk installs a
microphone; it does not change what your apps listen to, on purpose.
Dictation is not in this version yet. When it is not available the button is hidden
rather than greyed out, so its absence is the answer. See the
roadmap.
iPadOS microphone permission was refused. Settings → SOME Desk →
Microphone.
The Mac is hearing you and the dictation app is not listening, which is the case
above — check its input device. The meter is driven by the audio actually leaving the
iPad, so if it moves, the microphone half is working.
Dictate opens the iPad’s microphone. It does not press Wispr Flow’s
shortcut key, because you may have remapped it, or may be dictating into something
else entirely. If you want that key pressed too, turn it on in SOME Desk Host’s
settings on the Mac and choose the key yourself.
A safety net, not a fault. A locked-open microphone closes itself after ten minutes
so it cannot be left open for an afternoon. Hold or double-tap to open it again.
Expected. Installing the microphone restarts Core Audio.