There are a few potential reasons why you might be unable to withdraw money from Robinhood. Firstly, ensure that your account is verified and that you've provided accurate bank account information for the withdrawal. If your account verification is pending, this could be a temporary restriction. Additionally, if you have recently made a deposit or transferred funds, there might be a waiting period before you can withdraw to prevent fraudulent activity. Another factor to consider is if you have any unsettled trades or pending transactions, as these can temporarily restrict withdrawals.