Problems Upgrading to Premium

[marros 0]

I have tried multiple times to upgrade to premium. Each Time I get a request to login to my iTunes account for the Mac App Store - which I do successfully. And then I get an error in Evernote which I have attached to this message.

When I check my subscription in my app store account I can see that the subscription is set up for the premium amount (£4.99 per month) but I just keep getting this error and the premium features are not working.

Any help would be really appreciated.

Many Thanks.