Might not be the best place to say this, but considering Plex relies on online authentication servers to function it might be better for you to look into Jellyfin which works fully offline.
this post was submitted on 26 Dec 2023
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You can just skip auth on local IPs.
Make sure you don't use bit subnet masking i. e. 192.168.1.0/24
Use 192.168.1.0/255.255.255.0 version.