If your smart TV app has trouble connecting to a Media Server after September 30th, please ensure that both the app and the server are set to allow insecure connections: On the TV app*, ensure that Settings -> Advanced -> Allow Insecure Connections is set to Always, and on the server, ensure that Settings -> Network -> Secure connections is set to Preferred. These devices are no longer supported by their manufacturers, and won’t be receiving an update needed to continue making secure connections to a personal server. For any particular platform, the playback capabilities. Broader smart TV operating systems, which may be available across many different TV brands. These are broken out into two broad categories: Specific manufacturers/brands. Allow the application to be downloaded and sign in. Which Smart TV models are supported Plex offers player apps across a wide range of smart TV manufacturers and models. Select the application from the list and click on download. Tap on the search bar and search for the Plex application. Navigate to the home page and select the LG content store. On September 30, 2021, some older smart TVs (some Samsung, LG, Vizio, Hisense, and other unsupported TV platforms) will no longer be able to use secure connections to communicate with Plex Media Servers. Therefore to install the application follow the below procedure: Turn on your LG Smart TV. Still could be out of date/unsupported Is this your problem? LINK quote:

Just says server unavailable would you like to retry.

Plex app on lg tv