How do I log in directly to WordPress via Plesk?
Recently UpdatedWordPress Toolkit Login
Within the toolkit, we will see that there are 2 buttons. Login and setup. Clicking on the login button will take us to the WordPress management automatically.

WordPress Toolkit Account Setup
In the case where the login does not work, clicking on the setup button, you can reset the administrator password.

In the case where the login does not work, it is very likely that some plugin is blocking it.
If there is a security plugin or recaptcha, you can disable it from the list of plugins.