I'm using Magento 2.4.3. For some reason, guest checkout is still allowed, even after selecting the Allow Guest Checkout = No setting in the backend. It doesn't show the "Guest checkout is disabled" message anymore. It was working for a while, and then, it seemed to randomly stop working. I have tried changing the setting to Yes and then back to No and then re-indexing and clearing the cache, but guest checkout is still allowed. Any ideas?