Failed to join Replica. Call failed with status code 400 (Bad Request)
When attempting to join a replica to the SPP cluster, the replica does not join successfully and disappears from the cluster list then when checking the Activity Center report to see the reason for failure, the following reason is shown for the enrollment event:
Failed to join Replica. Call failed with status code 400 (Bad Request): POST https:///SPP_IP_Address:443/service/core/v4/Cluster/Members/join
Primary SPP node has a custom SSL certificate assigned that is not trusted by the Replica joining which has the default SSL certificate assigned.
Assign the default Safeguard SSL certificate to the Primary node then attempt to add the Replica. After enrollment succeeds then can assign the custom SSL certificate back to Primary node.