Feb 17 2021 02:13 AM
@elaheh Hello, if not disabled by policy the Team owners can delete messages. See the Team settings.
Manage messaging policies in Teams - Microsoft Teams | Microsoft Docs
Determines whether owners are allowed to delete all the messages in their team. Set this to TRUE to allow. Set this to FALSE to prohibit.
Set-CsTeamsMessagingPolicy (SkypeForBusiness) | Microsoft Docs