I know it will work if I add it to cheapantivirus.me zone. I want client to be able to use my subdomain with blogspot.com so instead of I manually add their subdomain to my own domain zone, I can just provide them with DNS module and they them self can add their own subdomain.cheapantivirus.me to the DNS zone.
If you have friends that have blogger account and need a free subdomain to use with blogger, you can provide them with.
Alhamdulillah. I test it and it works.

My setting:
in blogger domain setting I use
www.blog.cheapantivirus.me. Hope it helps.