I’ve found the issue – the Rewrite section needs to be before the WordPress section. Changing my .htaccess like this fixed the problem.
RewriteCond %{HTTP_HOST} !^www\.2A\.consulting
RewriteRule (.*) http://www.2A.consulting/$1 [R=301,L]
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress