I am also on that case.
Both of my secondary profiles, both with silver subscriptions and no account linked, did get this emblem. It just popped up at special orders. Strangely my main profile with gold subscriptions has yet to receive it.
There is a new notification around in relation to verifying emails, with states "in-game rewards" and shows the Sign of Unity. If this emblem is supposed to be the reward does not know anyone.
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Did you ever go on playstation home?