App is apparently abandoned
I emailed the app’s author through the link in the Apple App Store explaining the problem but it’s been a week with no reply.
The app has not been updated in 4 years. I have an iPhone 12 running IOS 15.3 so maybe I shouldn’t be surprised the app doesn’t work. My bad for not suspecting this before I bought the app. If you run similar hardware or IOS version buying this app is like throwing your money in the street.
If I get an app update that fixes the problem I’ll revisit this review.