Can't seem to block website on local device with WARP client installed

Hi,

I'm using Zero Trust for the first time and in a home environment. I'm trying to use it to block certain websites on multiple devices on the home network. I've setup a gateway, installed the WARP client, installed the certificate for HTTPS access, setup the firewall HTTP policy (Host, matches regex, .*youtube\.com), etc. 

According to the analytics, it is capturing the traffic, but I can go to youtube.com without any issue. Can someone tell me what I'm missing? 

Thanks!