cannot switch user

I'm running Ubuntu 24.04 on a Digital Ocean droplet.

At this step: 
`su - nostr`
I got this error: 
`This account is currently not available.`
and solved it by replacing the above command with
`su - -s /bin/bash nostr`
as per discussion here: https://serverfault.com/questions/149673/how-to-prevent-a-user-from-login-in-but-allow-su-user-in-linux