Error installing the FAQ app

[Tijner]

When we get to the point in SharePoint Online of actually getting into the managed app section "Select Purchase to buy this App or select Cancel to return to the App detail page.' we are getting the msg:

"Everything is fine, but we had a small problem getting your license. Please go back to the SharePoint Store to get this app again and you won't be charged for it."

when we then click "return to site" nothing happens and we are redirected to the "Getting started with your app catalog site"

We have done all the possible actions that you can find on the internet, but this message always comes up.