Synchronizing audio stream across multiple desktop devices

Server Version#:1.41.5.9522
Player Version#:1.109.0.329-ea562b95

Hi everyone, this is my first post on this forum.
I was hoping to find a solution to being able to play the same music from my collection simultaneously across several PCs in my home, and from what I read online PLEX seemed to be an option. I re-enabled the plex server on my WD MyCloud ‘NAS’ and installed plex clients on all my PCs (mostly Windows 11, one iMac). All my machines are running on the same WiFi network, most are running over ethernet. I can play content from the server without any issues on all of them, including my android phone. When playing something on one, I can see it from another’s dashboard, and I can query the machine’s name and details. I haven’t been able to cast? from any of them to another - select player: no players found. I played with firewall settings but no luck: The plex app is allowed through both private and public firewalls and disabling the firewalls outright had no effect.
I could really use some help from the plex community to either set me on the right path to getting all PCs synched to play audio or letting me know if this is even possible.
Cheers.

You cannot cast to the web app, nor to the Desktop app.
Try Plexamp. Settings - Playback - Remote Control
Though some of its features may require a Plex Pass.

But synchronized playback is currently not a feature in any case.

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