How to manage SSH accounts for specific users?

I’ve several users that they connect to my Server from their clients(Specific Clients) over the SSH, so I generate for them AuthorizedKeys.

Now I’ve two Users, UserA and UserB, I want to these users could be able to connect to my Server with any devices or any IP addresses, the point is I don’t wanna make Authorization Keys for them.

Is it possible ?

Right now, when they wanna connect to server, it says,

permission denied (publickey)

I even try to add this line to sshd_config :

AllowUsers UserA UserB

But the rest of the crew just see

permission denied

Thanks a lot …