Clicking 'get' on an app fails

[Jblockley]

Whenever I click Get to acquire and download an app the Store fails. The button is briefly replaced with a progress bar and the text 'working', but the screen soon refreshes and the Get button is back. The app doesn't download and isn't added to my list of apps. I have tried to download a few different apps to test and I get the same failure. I have also flushed the store cache, and my system is up to date and is otherwise fine. How do I get the store to work again?

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