Hi,
sometimes the Android build is broken because Phonegap Build requieres to enter a master password for the Android certificate. We are trying to fix this.
You can use this alternate link for direct download of the apk file instead: https://build.phonegap.com/apps/251002/builds
In any case, the app is available in the Play Store:
https://play.google.com/store/apps/details?id=com.moodle.moodlemobile
Regards