Read receipts in Microsoft Teams can be turned on for users to have a way to keep an eye on who has seen a message you have sent in the service. When a message is viewed by a recipient, the sender will be able to see that you have viewed the message.
To enable read receipts globally:
- Open Microsoft Teams admin center at https://admin.teams.microsoft.com/.
- Expand Messaging and click Messaging policies.
- Open the Global (Org-wide default) and locate the Read Receipts option. Change the setting to Turned on for everyone.
- Click Save.
The change may take some time to replicate through to end users.