Memcached (LSMCD) on LiteSpeed witth LSPHP74 and WordPress.

Hi, I am trying to install Memcached (LSMCD) on Ubuntu 18 with PHP 7.4.2 and WordPress.
I am following this:
and everything works. I can test it with:
telnet 11211
The problem is that, in WordPress admin panel, I see 'Memcached Extension: Disabled '.
I have installed and 'lsphp-memcached' and added or
to php.ini
and restarting the server, but still doesn't work.
I don't know what to do.