Password reset bug? – “Sorry, that key does not appear to be valid”

I had this problem and it took me all week to figure it out. I know OP has probably solved it by now, but for the others like me who surfed here looking for answers:

Open the wp-config.php file and use this website ( https://api.wordpress.org/secret-key/1.1/salt/ ) to replace the lines of code that start with: “define (‘AUTH_KEY’, ‘blablabla’);”

Please backup the file and/or comment out the old lines, just in case! Hope it works for you also!