I gather that the issue lies within the app's bothersome notification prompts. If a user leaves the app set to always notify, they'll be bombarded with unnecessary air notifications regularly. This prompts the user to disable said notification features and thusly will not see that you've replied to their message. Offerup should stop trying to advertise through these notifications and ONLY notify it's user base of replies/notifications to items which pertain to their previous actions.
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