I have the same issue, I've done a ton of public events and only received the one per day from the postmaster for the last 10 days or so. Yesterday I got screwed even more by getting a strange coin from the postmaster instead of an ascendant shard / energy. It really makes getting materials outside of the raid / dailies on 28 exceptionally hard.
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Vanguard marks, buy armour, dismantle. Don't leave it to chance!