Wonder if it is something to do with 'regional restrictions'. Are you in the US and purchasing from US Kindle Store? That should work, of course, but if you live in (for example) Latvia, then you probably cannot purchase from US Kindle Store without some special arrangement, like having a US address and credit card.
Of course, if you are able to purchase, you should be able to download as well, no matter where you are. But maybe there is some mismatch with your account settings. If you go to Manage Your Content and Devices, Settings, there is one called Country Settings. I'm guessing this needs to match the country of the Kindle Store you are using. But I cannot find any definitive information about it.
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