Hi, friend!
You need to check whether the parental control page template is blocklisted or trustlisted.
If the blocklist doesn't work, you can also click Advanced > Security tab, and choose IPv4 Filtering in the navigation tree on the left. In the pane on the right, enable the IP address filter function. After selecting the filter mode, click New. Then, in the dialog box that is displayed, configure the rule for filtering IP addresses from the WAN interface to the LAN port.
The IP address filter function is a security mechanism configured on the residential gateway. It enables or disables all or partial ports in an Intranet IP address segment to communicate with all or partial ports in an Extranet IP address segment. The IP address filter configuration is used to limit communication between an Intranet device and an Extranet device.
If the configuration still fails, provide a screenshot of the configuration page.
Thanks!