I wonder if it has a really old firmware on the Bond (maybe one of the earlier problematic ones).
There is a web GUI you can try to access and use if you can connect to the Bond setup WiFi (would recommend within 10 minutes of powering up the Bond) which can be used to configure the Bond Bridge to connect to your home WiFi; maybe then the new phone and the new app will see the Bond Bridge?
The new app also has a Chat feature in it (under Help Center) for you to be able to get some help directly from Bond staff during business hours, or you can submit an email to customerservice@olibra.io to create a ticket.