I have created docker swarm add join to it from another docker host. In main swarm host I have full control to any swarm services, network, secrets and so on.
But in joined node (worker swarm) for any attempt as
sudo docker node ls
or
sudo docker service ls
I receive
Error response from daemon: This node is not a swarm manager. Worker nodes can't be used to view or modify cluster state. Please run this command on a manager node or promote the current node to a manager.
Why? What going wrong?

And I can not attach from secondary node to swarm as manager, only as worker, of course:

Error response from daemon: manager stopped: can't initialize raft node: rpc error: code = Unknown desc = could not connect to prospective new cluster member using its advertised address: rpc error: code = DeadlineExceeded desc = context deadline exceeded

Obviously you did not join that node correctly. You might get help if you showed how you joined the node. Also check the swarm's status, for example https://stackoverflow.com/questions/...-in-swarm-mode.

By the way, Swarm is not a very future-proof technology. A year ago (?) Docker sold it to a company named Mirantis, which is a major Kubernetes contributor.

Thank you @berndbausch, but my idea is store password in one place and share it for all swarm. And I still can not rich this simple goal. Any commands wiht swarm finished with error. This two machines directly connected and has no firewalls. But

X: docker init
X: docker service create …
Y: docker swarm join --token YYYYY xxx.xxx.xxx.xxx:2377 (YYY - worker token)
X: docker node promote x-name
Y: docker node info
Error: manager stopped: can’t initialize raft node: rpc error: code = Unknown desc = could not connect to prospective new cluster member using its advertised address: rpc error: code = DeadlineExceeded desc = context deadline exceeded
Y: docker service list
Error response from daemon: This node is not a swarm manager. Use “docker swarm init” or “docker swarm join” to connect this node to swarm and try again.