In the destiny 2 companion app I have the number 5 that’s red around my icon, when I click it it says I have 5 messages. But when I click it it says I don’t have any messages and the number won’t go away.
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This happens to me too on ios. Seems to be related to having new notifications in the clan chat area. Take a look at clan chat, then see if the notification in messages goes away.
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Mine as well