Sir Fitzgerald the third

I LOVE this game. It’s so simple to build what you want, and has so much room for creativity. One of the most recent updates introduced the ability to gain gems without the need for inn-app purchases by watching ads, which would be great if it would allow me to watch the ad. Instead the button says “not available”. What isn’t available? I’m connected to the internet via WiFi, and I’ve tried other wireless networks, so I don’t think it’s that. It has worked once before, but I haven’t been able to