Right in one, VW for this app has chosen not to publish it in this region, you would need to change your locale to the UK or Europe in order to download the app, once you have the app on your phone you should be ok and can change back to your normal region. (it's a right royal pain to do this). If memory serves app updates will also cease for apps that aren't in your regions store.
Also the app might also do a geo check to see if it's in the right region, so it might fail to load also just because of that.
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