I just recently bought ten USB sound cards for a project I want to do involving ten Windows XP VMware instances. When I tried one of the USB audio cards I was surprised that it was plug & play and I had audio input from the get go. Though, the USB sound cards are not the two I listed above. But these USB sound cards are truly plug & play. In the audio device properties you should see a name saying something like USB sound card.
The USB sound card idea is in case the software method doesn't work for you in the video.
If you're into multi-room audio, check out a few Amazon Echo Dot's. They use WiFi and you can add an Amazon Music, Pandora, Spotify or iHeartradio App to your Amazon account in the Alexa App and play music in all rooms. Just some food for thought. That's really the cheap route. The more expensive route are SONOS smart speakers. But do note that the Echo Dots do have an external audio jack for speakers.
Full disclosure: I used to have Amazon Music, but from time to time sound tracks would disappear from my playlists. And I'm not the only one who had that issue. So being fed up with that nonsense I went for Spotify. Between Amazon Music, Spotify and Pandora, they all have their ups and downs. It seems you can't tell the Amazon Echo Dot by voice command to add such and such song if it isn't Amazon Music. Maybe that will change in the future. But using the Spotify App on a phone, tablet or computer, you can play music that way and control what devices play audio that are tied to your Spotify account. Be it on the computer or the Echo Dots at the same time.
Also, if you have the Spotify family plan, you can't add individual family members plan's to their Amazon Echo Dot. Each individual will have to have their own Amazon account tied to the Family plan so they have their own Spotify playlists. It's been at least three or four years now and many people have been asking about making it a feature to host all Spotify individuals in the family plan per one Amazon account and nothing has changed since then. It's really stupid because a minor can't have their own Amazon account. But there you go in case you or someone else reading this wanted to know.