Double Check
Is the 'accidental Zelle transfer' message a scam?
This is a scam
A typical version of this message
Hi, I accidentally sent you $250 through Zelle that was meant for my sister. I know this is awkward, but could you please send it back? I can send proof of the transfer. It was an honest mistake and I really need that money back.
Why it is a payment app scam
Yes. The 'accidental transfer' usually never happened — or it was made with a stolen bank account or card. If you send $250 'back', you are sending your own real money; when the stolen payment is reversed by the bank days later, you have lost both. Payment-app transfers between strangers are treated like cash, which is exactly why scammers use them.
What to do
Do not send anything back. Check your actual account balance yourself — often no money ever arrived. If a transfer really did land, tell your bank and let them reverse it properly; that protects you, sending it back yourself does not. Block the sender and report the message inside the app.