My hosting provider locked down certain file permissions, which was necessary for me to load pages on my site. I had a 404 error lockout set to "ban permanently". Because I didn't know my shared server was under attack. I received these errors without knowing. I was added to the internal blacklist of the 404 lockout system, which is inaccessible via the wp admin screens. My IP address was, however, added to the IP banning whitelist of WP Defender. I received a permanent ban via 404 errors and that ban overrides the whitelist. So I was permanently banned, even though I was the site admin.