okay the reason behind the incompatibility is an outdated Android version. The Oppo A37 runs on Android 5.1 which is quite old. with that the newer versions of YouTube app may no longer support this version. ***possible solutions to the problem try this;***
# ''install an older version of YouTube app via third party APK sites''
# ''give a try to ***YouTube Go*** which is considered a lighter version of the app''
# ''lastly use YouTube in a browser instead of an installed app''