Rancher 2.0 not able to add multiple nodes in cluster

Hi Guys,
I am trying to create a cluster with three nodes out of which one node is having all three options i.e. etcd, control plane and worker, and remaining two nodes should be only worker type. It works fine when adding the first node with all the roles, but while adding additional nodes as worker nodes, it does not add in the cluster. while installing the Rancher, I chose the standby option since I wanted only one stance of etcd in my one node, but I want to run worker node as part of same cluster. please suggest what needs to be done here.