smbclient not entering smb shell

I want to access an SMB share on our intranet. * When I execute

smbclient -L //intranet.host/ -U myuser

I can enter my password and get a list of all shares. * When I want to enter the smb shell with

smbclient //intranet.host/ -U myuser

I'm not asked for my password and the command returns without any output. What am I missing here?