plesk 12.5 phpmyadmin is requiring password after site imported from cpanel

I switched my cpanel server to a centos 7/plesk 12.5 server using the Plesk Migration Manager tool.
Everything went fine but now when I want to access phpmyadmin plesk is requiring me to input the password.
How can I avoid this?

Is there a way to access phpmyadmin as root, as it was in previous versions of plesk?

Thank you