Hi,
Have you done the cluster setup properly? While doing the cluster setup for the second node, you have to add that as part of the first cluster mentioning the primary server hostname/ip address and it's login details.
After this, in any of the servers appadmin page if you login, you should see both the servers under the System>Control center. By this you can ensure that they are part of the same cluster. The status of both the servers should be "IN_SERVICE". But for individual subsystem you should be able to see, one as "Master" and the other as Slave. (A Blue "M" or "S" will be there near respective subsystem)
You also require high availability license to work this.
HTH.
Thanks,
Manu