https://www.apkmirror.com/apk/facebook-2/work/work-344-0-0-38-116-release/workplace-from-facebook-344-0-0-38-116-2-android-apk-download/
Just downloaded the Workplace from Meta 344.0.0.38.116 (arm-v7a) (120-160dpi) (Android 6.0+) APK from @APKMirror