The Customer Portal app in Teams has three tabs: New requests, My requests, and Activity.
The first two are self-explanatory, but the third can confuse end users.
When admins deploy the Customer Portal app in Teams for the first time, end users are seeing this screen under the Activity tab:
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To prevent this, set up a welcome message for the end user explaining the app's purpose. This message posts automatically when the portal installs for them as a chat post and will lead them to the activity tab.
Use this welcome message for onboarding or to explain the page: https://support.yasoon.com/M365FJ/customer-portal-app#Why-notifications?.
New customers can configure this during portal installation and deployment via the Microsoft tenant via the Teams admin center.
Existing customers must re-deploy the Customer Portal in their tenant to activate the welcome message.