Adding a node from grid fails due to SSH configuration issue and returns the following error:
[INS-06003] Failed to setup passwordless SSH connectivity with the following node(s): node1, node2
Passwordless SSH configuration is a mandatory installation requirement. SSH is used during installation to configure cluster member nodes, and SSH is used after installation by configuration assistants, Oracle Enterprise Manager, Opatch, and other features.
If the system has OpenSSH 7.8 or later configured, then the Automatic Passwordless SSH configuration using OUI fails.
Manually setup SSH to the node that you want to add before performing the addnode operation.