Hi @jemetos!
Yes, a default Client Portal comes with the free Jetpack CRM plugin. When you install and activate the plugin, it will automatically create a Client Portal page with the [jetpackcrm_clientportal]
shortcode.
You mentioned when a login is tried, the page just refreshes. Could you please try ruling out any plugin conflict? Temporarily deactivate all plugins except Jetpack CRM to see if there’s a plugin conflict. If the issue is resolved with all other plugins deactivated, you can reactivate plugins one by one to discover which plugin is causing the problem.
Let us know how it goes.