We make sure our apps work on the most recent smartphone software versions. For iPhones, that's iOS 10 up to the most recent version.
For Android devices, that's Android version 7 up to the most recent version.
The Joyn app no longer supports older software versions. Your points are still linked to your email address, so you definitely didn't lose them!
Are you sure the newer version is running on your iPhone or Android phone?
Then check if you're actually logged in.