Tried all the troubleshooting steps: signed out, cleared cache, also reinstalled the Android app. Tried in orbit, in Tower and with game off. Acquiring the bounty in the app always just results in a spinning yellow circle, and no bounty.
EDIT: resolved! Went back through the help article again and realised I hadn't enabled push notifications in the app settings. Doh.
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BTW, I should add that I'm on a fairly old Android version: 7.0 (newest available for my old phone). Could that be the problem?