@MikeR2 there are network requirements for the Roku app to find your devices. First, the network must be using a private IP address range specified by RFC 1918. Here's the IPv4 information:
https://en.wikipedia.org/wiki/Private_network
The Internet Engineering Task Force (IETF) has directed the Internet Assigned Numbers Authority (IANA) to reserve the following IPv4 address ranges for private networks:
RFC 1918 name IP address range Number of addresses Largest CIDR block (subnet mask) Host ID size Mask bits Classful description[Note 1]
| 24-bit block | 10.0.0.0 – 10.255.255.255 | 16777216 | 10.0.0.0/8 (255.0.0.0) | 24 bits | 8 bits | single class A network |
| 20-bit block | 172.16.0.0 – 172.31.255.255 | 1048576 | 172.16.0.0/12 (255.240.0.0) | 20 bits | 12 bits | 16 contiguous class B networks |
| 16-bit block | 192.168.0.0 – 192.168.255.255 | 65536 | 192.168.0.0/16 (255.255.0.0) | 16 bits | 16 bits | 256 contiguous class C networks |
Any network using IPv4 addresses outside these blocks are considered public, and the Roku app will not work on it. Most home networks use an address from the 16-bit block (usually 192.168.0.x or 192.168.1.x), but the addresses used are configurable and someone might had configured them wrong.
The next requirement is that the network is not using any sort of security block that keeps connected devices from seeing each other. This sort of security is found on semi-private networks, such as hotel WiFi, college student networks, or even home networks that are labeled as "guest" access. It's also something that might be enabled on an otherwise acceptable network. You would need to check your router settings to see if this is the case on your home network.
Dan
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