Sign in with X is not switched on in the Privy app yet.Until it is, sign-in here is email or wallet, and money cannot be addressed to an @handle. Turn it on in the Privy dashboard → Login methods → Twitter (X).
Your sign-in has no X account linked, so nothing can be addressed to you yet.
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When someone replies @TweetSend $10 under one of your tweets and pays, it shows up here.