HDR to SDR tone mapping support is currently available as a Plex Pass preview and requires an active Plex Pass subscription for the main Plex Media Server account.
Okay cool, so it sounds like it would fix this issue for all my users as long as I maintain Plex Pass or buy a lifetime subscription. I might consider this since it’s easier than talking my friends into investing in a nice HDR TV or watching shows from their house and feeling pained that they don’t seem to care.