Running the official YouTube app on Android 5.1.1 (Lollipop) can be tricky because Google has officially discontinued support for these older versions.
Using older Android versions carries security risks as they no longer receive official security updates from Google. for one of these alternatives? Youtube For Android 5.1.1
Google officially deprecated support for Android Lollipop (versions 5.0 and 5.1.1) several years ago. The modern YouTube application available on the Google Play Store requires much newer API levels to run. Running the official YouTube app on Android 5
When the official app fails, third-party open-source clients offer the best solution. The premier choice for older Android devices is , specifically its legacy builds. Youtube For Android 5.1.1
YouTube for Android 5.1.1: How to Watch Videos on Older Devices