The Keychain is different -- you may need to create a new keychain
if you cannot reset password. This site linked shows these options.
•Mac OS X - Working with the System Keychain
https://kb.wisc.edu/helpdesk/page.php?id=2197
Not sure if there isn't yet another issue, due to how you wrote inquiry.
{There may be an issue with certificates if you're trying to use old Safari
& if those secure site certificates have expired w/o suitable replacement.}
In any event...
Good luck & happy trails! 🙂