My custom domain isn't working

• It’s only been a few hours. DNS changes can take up to 48 hours. Check progress at dnschecker.org, then click Check Status in Webpage Settings.
• Wrong CNAME name. For book.yourcompany.com, the Name is book, not the full domain. For a root domain, use @.
• Wrong value. Copy the value exactly from the DNS Setup Guide. It’s only generated after you save your domain.
• “Too many redirects” on Cloudflare. Set SSL/TLS mode to Full or Full (strict), or switch the record to DNS only (grey cloud).
• You entered https://. Enter the domain without http:// or https://.

See Connect a custom domain.