I’ve had this issue and also got no response from Orbit. But, for Android app, I found that deleting the app cache and data, then logging back into the app, I was able to restore the notifications.
So in Android settings, go to Apps, then go to Bhyve, then click on Storage.
You have two options, to Clear Data, and Clear Cache. I can’t remember which of the two was the one that did it for me. Try just deleting the cache first, restarting phone, and if that doesn’t resolve it, do the data. If that still doesn’t resolve it, try doing both, then uninstalling the app, rebooting, and then reinstalling. I’m 95% certain this will help you.
Boooooo and thumbs down to Orbit for allowing the app to still do this to us and for not better supporting us!