在powershell中添加teamChannelUser命令时会发生什么情况？

当我执行命令时：

  Add-TeamChannelUser -GroupID $group -DisplayName "Blabla" -user $user 

如果频道不存在，则创建一个新频道，或只是说无法将用户添加到所述频道？

上述命令

Add-TeamChannelUser -GroupID $group -DisplayName "Blabla" -user $user

返回以下错误

 Add-TeamChannelUser : The term 'Add-TeamChannelUser' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ Add-TeamChannelUser -GroupID $group -DisplayName "Blabla" -user $user
+ ~~~~~~~~~~~~~~~~~~~
 + CategoryInfo : ObjectNotFound: (Add-TeamChannelUser:String) [], CommandNotFoundException
 + FullyQualifiedErrorId : CommandNotFoundException

---

-User

应该是用户的UPN（用户主体名称-例如。johndoe@example.com)是这样吗？@Sam有什么新消息吗？