Your site could not complete a loopback request

Hi my site generates the site health error when I activate the “Rename Login Page” feature

Your site could not complete a loopback request

Loopback requests are used to run scheduled events, and are also used by the built-in editors for themes and plugins to verify code stability.

The loopback request returned an unexpected http status code, 403, it was not possible to determine if this will prevent features from working as expected.

Any ideas on how to fix it?

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