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Can't Find Java/Code Block

Hi, so I've followed the article https://help.landbot.io/article/zpw4d40brv-add-a-click-to-call-email-whats-app-button-bricks so I can add a Click-To Call feature (so the user calls direct) but I can't find any where I select the Java/Code Block, it's not showing up in the Bot Builder Menu or search. Help 😞 Tried resting my browser and machine.