All visitors only receiving A variation

Make sure your htaccess file is writable. It controls the a/b switching.

Can you look in the debug tab of settings and post your htaccess here?

Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^themckenziefirm.com [nc]
rewriterule ^(.*)$ https://www.themckenziefirm.com/$1 [r=301,nc]

# BEGIN WordPress

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

You are missing the landing page rewrites. You need the bolded text inside your rewrite rules

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{QUERY_STRING} !lp-variation-id
RewriteRule ^go/([^/]*)? /wp-content/plugins/landing-pages/modules/module.redirect-ab-testing.php?permalink_name=$1 [QSA,L]
RewriteRule ^landing-page=([^/]*)? /wp-content/plugins/landing-pages/modules/module.redirect-ab-testing.php?permalink_name=$1 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Thanks! I will give it a shot and let you know when I’ve confirmed it works.

Unfortunately, this does not appear to have solved the problem. I have had 10 more people visit over the last day, and they’ve all gone to the ‘A’ variation. To confirm, here’s the current version of my .htaccess file:

Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^themckenziefirm.com [nc]
rewriterule ^(.*)$ https://www.themckenziefirm.com/$1 [r=301,nc]

# BEGIN WordPress

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{QUERY_STRING} !lp-variation-id
RewriteRule ^go/([^/]*)? /wp-content/plugins/landing-pages/modules/module.redirect-ab-testing.php?permalink_name=$1 [QSA,L]
RewriteRule ^landing-page=([^/]*)? /wp-content/plugins/landing-pages/modules/module.redirect-ab-testing.php?permalink_name=$1 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Sounds like a plugin/theme conflict.

To test for a theme conflict:

1. Activate default Twenty Ten, Eleven, Twelve, or Thirteen theme
2. Check to see if the issue still occurs
3. If the issue does not occur after having activated the default “Twenty” theme, your theme is causing a conflict with landing pages.

To test for a plugin conflict:

1. Deactivate ALL plugins
2. Activate Landing Pages
3. Check to see if the issue occurs

If the issue does not occur, one (or more) of your plugins is causing a conflict with Landing Pages.

To determine which plugin(s) is causing the conflict, follow these steps:

1. Activate each plugin one by one
2. Check to see if the issue occurs after each plugin is activated