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Accessory is not reachable in Homekit

So my bridge lost connection with HomeKit. It works fine in the Tado app, I can access Home and Tado away from home so I know my network is fine. Can see Philips hue in HomeKit.
I tried a reset and hard reset. I can see the bridge when I use camera and it grabs the numbers. I click the bridge and it says connecting, then says adding.
After about 5mins I get an orange warning triangle saying Accesory is not reachable.
Tried resetting my phone, tried on my iPad, tried to move bridge into a switch, then moved it to being directly into the Vodafone Hub.
All the same, can anyone help me with what I can do to get this back on? It’s really useful for the automation of my family coming and going from home.