Thanks for trying the previous potential fixes - I'm sorry things still aren't working. To clarify, have you attempted to use another device to see if you are able to connect?
Please also be aware, the Connect App won't allow the connection if you're on a Guest network, VPN or Mobile Data. If this still doesn't help, please try these steps:
For your Apple device, you can try this: Open Settings > Tap your name > Tap iCloud > Tap Manage Settings > Tap the Connect App > Tap Delete Data.
For your Android device, you can try this: Open settings > Apps > Connect App > Storage > Clear data / Clear cache.
In a small number of instances, we are aware of a problem that is causing the app to not recognise the Hub. Our teams are aware of this, and are working on resolving this issue as quickly as possible.