Kerberos Failover not working while using includedir /etc/krb5.conf.d/

Issue

• During an outage of the primary Kerberos server, users can't authenticate.
• We dont see attempt goining to other servers mentioned under /etc/krb5.conf.d/
• kinit: Cannot find KDC for realm "example.com" while getting initial credentials

# ls -l /etc/krb5.conf.d/example.com
-rw-rw-rw-. 1 root root 243 May 16 02:32 example.com <---------------

# cat /etc/krb5.conf.d/example.com
[realms]
example.com = {
  kdc = ad1.example.com
  kdc = idmserver2.example.com:88
  master_kdc = idmserver2.example.com:88
  admin_server = idmserver2.example.com:749
}