BT Sport won't let me log in
I've been enjoying streaming BT Sports to my iMac. But now it won't let me log in. The error message is: "You have had too many unsuccessful attempts to login. You have been temporarily locked out. Please try after 15 minutes." which is rubbish. Before that, the error message was about Cookies Websites which I couldn't understand. Thanks in advance for any help, Nick
iMac 27", macOS 10.13