Been 1.5 hours and the companion app has not updated, telling me that it "Failed to download required Destiny 2 content. Please try again." along with a Retry button that doesn't do anything when tapped. I have logged out once and uninstalled twice.
What gives?
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I had the same issue. I fixed it by enabling permissions: storage in the app info on my phone itself; then reopened the app and the database downloaded / installed correctly.