OK I am trying to understand exactly what you are doing here so I can try and test it on a server.
Many time ago I created this Room with 6 Users
OK.
Create a daily channel for the team and set the Autojoin.
But you already have a channel above? Why create a new one?
I think you may be confusing Teams and Channels/Groups somehow, and possibly a ‘bug’ has allowed you to do something you probably shouldn’t and has now been closed. It won’t be the first time this has happened!
These are the two methods I know of.
With no teams:
Create a Private Room or Public Channel and add then add users.
You can script to create the Room/.Channel and ad all your users
Or:
Create a room/channel, create a Team, add users to the Team, add Rooms or Channels that you want them to join, and and set autojoin.
They should be automatically joined to that room/channel.
You should only need to add a user to the Team for them to join any channels.
Please explain exactly what you are trying to do, and show me how you do it all so I can try and replicate it.