You would see an “invalid account” / “authorization failed” / “unauthorized” error message when you have either entered your password incorrectly or when you have not connected to our servers.
Please make sure you select mt4.prosperity.com (prosperity-Live) as the server when logging in to a Live Account. For your Demo Account, the selection should be demo.prosperity.com (prosperity-Demo).
Try the server selection first and if the server selection is not the issue, please try resetting your MetaTrader password.
Click here to see how you can reset your MetaTrader password.