Cant grant permissions to access local network on new iPhone

Plex Players Mobile Devices
10

So the router I use has this as the default IP: http://192.168.8.1/
The range for the LAN is 192.168.8.100 to 192.168.8.249
The server “Surface2Laptop” is 192.168.8.172

Laptop as plex media server in minivan for movies - multiple kids