I have my M5 setup in Router mode and am trying to work out what I need to do to solve the following problem:

I have a device connected to my Guest network which I cant seem to access FROM my main network.

When I try from HA sitting on my main network I get:

2024-02-05 09:50:00,122 - Inv1 - sync        -  [ERROR   ] - Connection to (nnn.nnn.nn.nnn, 8899) failed: timed out
2024-02-05 09:50:01,174 - Inv1 - sync        -  [ERROR   ] - Connection to (nnn.nnn.nn.nnn, 8899) failed: [Errno 113] Host is unreachable

When I try and connect from an Android app associated to the device whilst my phone is connected to the main network it also fails but if I connect my phone to the Guest network it works.

This makes me think there is something that is stopping my main network talking to devices on the Guest network. 

1) Is this expected behavior for the M5? I know devices on the Guest network cant connect to resources on Main but didn't think it was the other way around?

2) If this is the case then how can I fix it, do I need to star setting up Static Routes as haven't used those before?

3) Or will it only work if I move all my devices in to the same network?

Many thanks,

Ross