Unable to add some domains in Cloudflare

{
    "success": false,
    "errors": [
        {
            "code": 1099,
            "message": "We were unable to identify xn--0z9h.to as a registered domain. Please ensure you are providing the root domain and not any subdomains (e.g., example.com, not subdomain.example.com)"
        }
    ],
    "messages": [],
    "result": null
}

{
    "success": false,
    "errors": [
        {
            "code": 1105,
            "message": "You attempted to add this domain too many times within a short period. Wait at least 3 hours and try adding it again."
        }
    ],
    "messages": [],
    "result": null
}