OK, some progress... It seems that the kernel is reporting your Nintendo
USB microphone as an output device. And PulseAudio always prioritizes
recently-attached USB output devices. So PulseAudio is behaving
correctly.

If the microphone is not meant to also act as a speaker then this is a
kernel bug.

** No longer affects: gnome-settings-daemon (Ubuntu)

** No longer affects: gnome-control-center (Ubuntu)

** No longer affects: mate-control-center (Ubuntu)

** No longer affects: mate-settings-daemon (Ubuntu)

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: pulseaudio (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1748620

Title:
  PulseAudio defaults audio output to the USB microphone (Nintendo
  WUP-021-0)

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