From Local Client:
I can ping ipv4 of D.O. server.
I cannot ping ipv6 address (times out)
I cannot ping domain.com (times out)
I cannot ping www.domain.com (times out)

From D.O. Server
I can ping domain.com
I can ping www.domain.com

DNS propagation is 100% complete as verified on whatsmydns
I verified that the DN setting are correct
A record is correct
AAAA record is correct
CNAME record is correct