https://www.apkmirror.com/apk/facebook-2/work/work-243-0-0-47-108-release/workplace-by-facebook-243-0-0-47-108-4-android-apk-download/
Just downloaded the Workplace from Meta 243.0.0.47.108 (arm64-v8a) (560-640dpi) (Android 4.1+) APK from @APKMirror