When can I use the app where Google Play is unavailable?
[spoiler]Moderator edit: This thread has been moved to the #Help forum where you can find answers and troubleshoot any Destiny in-game/bungie.net/companion app issues, courtesy of other helpful players and Mentors.
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Unsure if it's a supported case, and definitely USE AT YOUR OWN RISK, but there's a handful of Google Play FOSS alternatives (e.g. Aurora Store) or APK sites (e.g. APKMirror). There is no guarantee that either of these will work as intended or be safe, though.