User getting 403 forbidden error on site login page

The user is unable to access the login page on one of the domains configured using Cloudflare DNS with Sucuri firewall and getting a 403 forbidden page by Cloudflare.
Is this an access issue because of Cloudflare if so there are no access rules set in the Cloudflare dashboard and also the IP address of the user is already added to the Sucuri firewall allowlist for allowing access to the domain.