That’s the older RC app. A newer production version was released yesterday.
When did your Battery Cam Pro problem start? What firmware are you using on that Cam? If you’re using a beta/RC app, then do you have a buggy beta firmware on the Cam, too?
I haven’t seen other users report this specific issue, so if you’re not aware of anything on your end that’s disabling notifications then I wonder if there’s some combination of app and/or firmware that’s causing this for you. If you think that might be the case, then I’d be inclined to log it and then post a report and Log ID to the appropriate Beta topic. What I’m seeing in a quick search looks like the most recent firmware release for Battery Cam Pro was production in September of last year, so I imagine that’s what you’re using, but it’d be good to check.
I think I’d probably try to update the app to the most recent production version (the one I saw in Google Play Store yesterday) and see if that makes a difference.