There are several potential reasons why you might be unable to log into your Robinhood account. The most common issue is entering incorrect login credentials, such as a mistyped email or password. Double-check that you’re using the correct email address and password associated with your account. If you’ve forgotten your password, use the “Forgot Password?” link on the login page to reset it.
https://myrbkc.rbkc.gov.uk/forums/general-discussion/4359fa1c-21de-ef11-a81b-6045bde1041a