Chat in a meeting of a Teams channel for guest

@Sharon Zhao-MSFT I tried the steps you provided but I get the following error:

Set-CsTeamsGuestMessagingConfiguration : The term 'Set-CsTeamsGuestMessagingConfiguration' 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

• Set-CsTeamsGuestMessagingConfiguration -AllowUserChat $True
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : ObjectNotFound: (Set-CsTeamsGuestMessagingConfiguration:String) [], CommandNotFoundExcep
  tion
• FullyQualifiedErrorId : CommandNotFoundException

@Sebastiano Tropea ,

You can execute the following command to allow guest users to chat:

Set-CsTeamsGuestMessagingConfiguration -AllowUserChat $True

Before you start, installing the Teams PowerShell module. Then, connect using an admin credentials. For more details, please refer tot this article: https://learn.microsoft.com/en-us/microsoft-365/enterprise/manage-skype-for-business-online-with-microsoft-365-powershell?view=o365-worldwide.

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