Why might Private DNS with Cloudflare not be working on my Android 14 device?

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Grade: Education Subject: Support
Why might Private DNS with Cloudflare not be working on my Android 14 device?
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Possible reasons include: incorrect hostname entered (ensure it's 'one.one.one.one' or '1dot1dot1dot1.cloudflare-dns.com'), your mobile network operator blocking DNS over TLS, a conflicting VPN or firewall configuration, or a bug in the Android 14 installation. Try restarting your device or checking for Android updates.