The link does not open a chatroom. Can anyone tell me what’s wrong? Thanks!
I repeated your commands and Mathematica replied that there is a chatroom of this name already
The next step (did you take this step?) is to open a Chat session (File → New → Chat Session)
then you will have the option to join a chat in this specific chatroom (you need to check the chatroom you would like to join)
Curious, I changed the name and the output no longer gives a cloud object.