Setting up High Availability only requires an add ha node entry per node. For example on one node is greater than add ha node 1 10.72.142.70. And on the other it is greater than add ha node 1 10.72.142.50. (Node IDs don't need to be unique.)

If everything goes well the result should look like this. The key areas of the output are highlighted:

The SSL card status NOT PRESENT, in the preceding output, is not a problem in a VPX which may or may not have an SSL card. But any instance where card is present and shows DOWN needs immediate attention.