I can see the same thing here. 
No HDMI device can be found in the output devices list, 

My trace from the control center shows that the HDMI ports are
unavailable, this would be why ...

>>>>>>>>>>>>>>>>>>
 SET PROFILES HDMI / DisplayPort 3
 create_ui_device_from_port, direction 1 
 description HDMI / DisplayPort 3 
 origin Built-in Audio 
 port available 0 
 

 SET PROFILES HDMI / DisplayPort 2
 create_ui_device_from_port, direction 1 
 description HDMI / DisplayPort 2 
 origin Built-in Audio 
 port available 0 
 

 SET PROFILES HDMI / DisplayPort
 create_ui_device_from_port, direction 1 
 description HDMI / DisplayPort 
 origin Built-in Audio 
 port available 0 
 

 SET PROFILES Microphone
 create_ui_device_from_port, direction 0 
 description Microphone 
 origin Built-in Audio 
 port available 0 


** Tags added: soundnua

** Changed in: gnome-control-center (Ubuntu)
   Importance: Undecided => Medium

** Changed in: gnome-control-center (Ubuntu)
     Assignee: (unassigned) => Conor Curran (cjcurran)

** Changed in: gnome-control-center (Ubuntu)
     Assignee: Conor Curran (cjcurran) => David Henningsson (diwic)

** Changed in: gnome-control-center (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/961286

Title:
  HDMI audio device detected by the system but not listed in Sound
  Settings

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