wps-hide-login plugin did not work

Please check the random string 10 characters has only lower case alphabets and numbers. It should not have any upper case alphabets or special characters. If your random string 10 characters had upper case alphabets, WPS Hide Login plugin will convert them into lower case alphabets (not sure what it does to special characters; haven’t tried that). Try to login using all lower case alphabets in random string 10 characters.

Alternatively you can log into your hosting company’s cPanel and access your site from there, then go to WPS Hide Login plugin setting (Under SETTINGS > GENERAL) and check what is the random string 10 characters.

Hope it helps.