Since a few weeks I can't use the feature for upgrading buildings 25% faster by watching an ad anymore. When I try to watch it, I get this error:
Could it be that there currently aren't ads available for specific countries like The Netherlands or Belgium? Because I heard from other players living in other countries that they still could use the feature.
When I was in another country a weeks ago, I could watch the ads which made me think it depends on the country you are living in.