To request a refund on Robinhood, you need to contact 1-844-673-0406 their support team. You can initiate a refund request through the Robinhood app or by calling their 1-844-673-0406 customer service line. The specific process will depend on the type of transaction you're requesting a refund for, 1-844-673-0406 such as an unauthorized transaction, duplicate charge, or incorrect amount.