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Why is this uncle not helping me this time!!? So frustrating, do I only have the option to accept the punishment!!

Today a new friend who just joined ⭕ not long ago asked me, looking for a (seller), transferred 20 to (the seller), but didn't get U, was scammed; can this be recovered?

The situation is like this, siblings analyze, can we recover through the uncle?
My friend said that because he had traded with him before, it was normal to give me U, so he trusted this seller quite a lot, named A. Normally buying from A would just be about a five-cent markup. Recently, when my friend sought to purchase, A said to first give him the money, let him collect it offline, making it cheaper.