Problems logging in to admin area

Hi all, hope someone can help.

I did a site a few years back and is working fine. The client has just called to change address details as he has moved office.

I have tried to log in to the backend and it’s saying the details have not been recognised. I cannot request a password reset either as it says the email does not exist.

I have been into the database and checked the username, password and admin email and are all correct.

I have tried changing the password as per instructions, but still no joy.

Using the Avada theme.

Have full access to the files on FTP.

Does anyone know what the issue could be, really need to make these small changes

Thank you in advance

Paul Walker

The page I need help with: [log in to see the link]