CNAME propagation is currently unknown

Hi,

I’ve created CNAME records for “email.marketing.smartcarrental.mx” domain and looking for propagation the status IS CURRENTLY UNKNOWN:

Test 1 - https://mxtoolbox.com/SuperTool.aspx?action=cname:email.marketing.smartcarrental.mx
Test 2 - https://www.whatsmydns.net/#CNAME/email.marketing.smartcarrental.mx

This CNAME was created since 48 hours, why I still get this status?
Regards.

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