403 Forbidden Error on User Registration Settings

Hello,

I have installed a brand new copy of WordPress with just your plugin activated (no others installed).

When I go to the ‘User Registration’ section, click on the ‘Check this if you want to automatically disable …’ check box, then click on ‘Save Settings’ I get a ‘403 Forbidden You don’t have permission to access this resource’ message from the website server.

The same happens when I try to update file permissions in the ‘Filesystem Security’ section.

Any ideas on why this is happening would be most helpful.

Thank you in advance

Guy Newell

WordPress 5.6.1 running Twenty Twenty-One theme.
All In One WP Security & Firewall: Version 4.4.6
PHP Version: 7.3.19
Website Server: Apache