They’ve just dropped a new app and you can buy XMR straight with your bank card. No need to buy EUR/USD/BTC first anymore. Links below.

https://apps.apple.com/gb/app/kraken-buy-bitcoin-crypto/id1481947260

https://play.google.com/store/apps/details?id=com.kraken.invest.app&hl=en_GB&gl=US