Support

On 23.6 there's an alternative for renaming services/provider.php. You should use that. The Rescue Mode email will only work if your IP address is temporarily blocked. If it's a different issue, e.g. the secret URL parameter, it may not do anything. Renaming the provider.php file always works, as it prevents Joomla from loading the Admin Tools system plugin at all.

I recommend bookmarking these pages. Short URLs to them are emailed to you every time you change the configuration of Admin Tools or any component, but having the bookmarks means you can quickly look up these documentation pages even when you're blocked at any other time.

You didn't read that page, did you? :) Under "Using FTP to regain access to your site's administrator" it tells you this:

Go inside the plugins/system/admintools/services directory. You will see a file named provider.php. Rename it to provider-disable.php. This will turn disable the Web Application Firewall from executing and you can access your site's back-end again.

Please do read the rest of that page.

Any method you choose to unblock yourself hinges on the premise that you do want to be unprotected very briefly just so you can get into the site and work on rectifying the reason you got blocked in the first place.

The documentation page I linked you to does tell you what to do to find out why you are blocked and how to address that. Give it two read-throughs so you are aware of what you need to do, then just follow it after logging into your site. It will take you a minute or two.