A margin call won't hurt your credit because you will ultimately end up making a timely payment, either through depositing money or liquidation.

What happens when you get a margin call?

A margin call occurs when the value of an investor's margin account falls below the broker's required amount. ... When a margin call occurs, the investor must choose to either deposit more money in the account or sell some of the assets held in their account.

Does Robinhood margin affect credit score?

Does Robinhood affect my credit score? No, investing with Robinhood has no effect on your credit score. Robinhood does not run a credit check on users who open an account with them.