Rewrites in .htaccess no applied

[DennisHermannsen]

Hi!

 

I'm having some trouble getting rewrites working in WHMCS. We've installed WHMCS in /client. The root is just a WordPress installation.

Content of WHMCS .htaccess:

### BEGIN - WHMCS managed rules - DO NOT EDIT BETWEEN WHMCS MARKERS ###
<IfModule mod_rewrite.c>
RewriteEngine on

# RewriteBase is set to "/" so rules do not need updating if the
# installation directory is relocated.  It is imperative that
# there is also a RewriteCond rule later that can effectively get
# the actual value by comparison against the request URI.
#
# If there are _any_ other RewriteBase directives in this file,
# the last entry will take precedence!
RewriteBase /

# Redirect directories to an address with slash
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^(.+[^/])$  $1/ [R]

# Send all remaining (routable paths) through index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
# Determine and use the actual base
RewriteCond $0#%{REQUEST_URI} ([^#]*)#(.*)\1$
RewriteRule ^.*$ %2index.php [QSA,L]
</IfModule>
### END - WHMCS managed rules - DO NOT EDIT BETWEEN WHMCS MARKERS ###

RewriteRule ^client/file client/file.php [NC]
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php [NC,L]

I've tried in so many ways to have the .php extension removed from a custom file located in /client/file.php, but with no luck.

Another weird thing is that we need to access https://domain.tld/client/admin/ - if we leave out the last forward slash, we're getting a 404 page.

 

Any ideas? Could the WordPress config installed in the root mess with this?