(please share the FULL error message you see, if applicable) There is no error message, it is just the fact that the ‘Custom Domain’ option to link my Namescheap domain isn’t available. On numourous guides and tutorials it shows a ‘custom domain’ tab to input your own DNS instead of choosing a sub domain and checking availability. On my page, that entire custom domain option doesn’t show. I’ve tried on Microsoft Edge, Google Chrome, removed all adblocks and still the option doesn’t show. Why is that?
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(other information and details relevant to your question)
Due to a recent change, you’ll need to create a hosting account with a free subdomain first. After setting up your hosting account, you can then add your custom domain from Namecheap and remove the initial free subdomain if you want.