ERR_TOO_MANY_REDIRECTS after installing defender plugin

Getting ERR_TOO_MANY_REDIRECTS error while trying to access wp-login.php and wp-admin after installing defender plugin.

Only occurs over the main site which has the security certificate installed. Were running a multisite and do not have a wildcard SSL installed at this point just a standard SSL on

Tried deactivating the plugin but the issue has continued.

Can login to the site using which opens up an alternative login page.

Have checked the wp-config and site url in the database is set as

Have disabled..
// define('FORCE_SSL_ADMIN', true);


Have cleared cookies and the same problem persists

Can login to sub sites using the http non ssl subdomains.

Using LE Lets Encrypt SSL

.htaccess file..
# Allow LE access to .well-known directory
RewriteRule ^.well-known/(.*)$ - [L]
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On

RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

# END WordPress

## WP Defender - Prevent information disclosure ##
Options -Indexes
<FilesMatch "\.(txt|md|exe|sh|bak|inc|pot|po|mo|log|sql)$">
Order allow,deny
Deny from all
## WP Defender - End ##

Have tried removing defender entries on .htaccess.. doesn't make any difference.

Any suggestions help appreciated..