In some cases, an Nvidia Plex server won't connect to wifi and gives an error related to poor wi-fi network settings.
This is caused by the router using what Nvidia considers a low-power channel (Channels 36-64)
Option 1:
To correct this, turn on the "enable low power channels" setting on the Nvidia device when configuring the Wi-Fi connection and you will be able to connect.
Note: that the Nvidia device respects the "low power channel" regulations and will reduce it's wifi transmit power on the Low Power Channels. This cannot be changed.
Option 2:
Alternatively change the router's wifi settings to use a high power channel (channels 100-140) if possible
Low Power Channels (200mw - 23db maximum)
Channels 36-64
Channels 36 and 52 preferred
High Power Channels (1000mw - 30db maximum)
Channels 100-140
Channels 100 and 116 preferred