This blog will explain how you can embed PowerApps Portal in Microsoft Teams.
Follow Below steps to achieve this:
- Select the channel under which you want to embed the PowerApps portal.
- Click on Add a tab “+” Icon.

- Search and select Website.

- Enter the Tab name and paste the URL of your portal.

After saving you can see the portal.

- Sign in to Portal to view data.

Portal Securities like Web Roles, Entity Permissions will work as expected.
This step by step procedure will help you to embed PowerApps Portal to MS Teams.