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Thank you, bro! Media keys started to work after I had disabled "Hardware Media Key Handling" from Google Chrome.
I finally found the way to have it working (if you are a Chrome browser user), whether with deb package or snap on Ubuntu 19.10.
First of all check in Settings > Devices > Keyboard Shortcuts that your Media Keys are present (release update from 19.04 to 19.10 set them all to Disabled in my case)
Then open Chrome browser :
Yes, problem was Chrome's hardware media key handling for me, too.