Verification Failed

Verification Failed

Hello
Already I changed my CNAME is a few hours, and whenever I type ZB ******. <Yourdomain> .com, works correctly. However, when I try to check the error appears: 
Verification Failed ---
Sorry! We are Unable to VERIFY the domain by CNAME method. You can try the other verification methods, or correct the CNAME record and try again.Learn More

How can I fix this problem?