: Android 5.1.1 is over a decade old; Google stopped security updates for it in 2018. Version Mismatch : Most modern versions of the YouTube app require at least Android 8.0 or 9.0 to function. API Deprecation
The last official version of the YouTube app that supports Android 5.1.1 is (released in late 2021). After that, version 17.30+ required Android 6.0 or higher. app youtube android 5.1.1
The YouTube app on Android 5.1.1 was significant for several reasons: : Android 5