Vimeo-Based Apps Buffering

Hello,

I'm new to using a DNS blocker, and I've noticed that a Vimeo based streaming service I use, namely 2nd Try, has a constant buffering screen when it's active. I've turned it off and it works fine, so I know it's the blocker. I'm not positive which domain I need to whitelist, and I've tried to whitelist all the ones that show as blocked when I use the app, but it's still blocked. I use an Android device.