To prevent users from deleting messages posted in private chats and channels, you need to manage the messaging policies in Teams. Here are the steps to follow:
Sign in to the Teams admin center with your admin credentials.
Go to Teams apps > Messaging policies.
Select the policy that you want to modify, such as the global (Org-wide default) policy or a custom policy.
Turn off the following settings: Owners can delete sent messages, Users can delete sent messages, and Users can edit sent messages.
Click Save to apply the changes.
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