The current user is not defined on the cluster. The current user is defined on an authentication service, and the cluster is configured to use that authentication service. You must use the authentication service to change the current user's password.
If you want to enable command-line interface (CLI) access to the cluster by using an SSH key, you must define the current user on the cluster and associate the SSH key with that user. If you also want to continue using the authentication service for the current user, you must enable the 'remote' setting for the new current user account that you create on the cluster.
If you want to change your password, use the authentication service for that task.
If you want to enable command-line interface (CLI) access to the cluster by using an SSH key, define your user account on the cluster and associate the ssh key with that definition. If you also want to continue using the authentication service to authorize your user account, enable the 'remote' setting for your newly created user account on the cluster.