Hi @Veronika SURNINA,
To add a SharePoint site as an app to Teams at the organization level, you need to integrate Teams with 3rd party add-ins. For example, you can use the Intranet by Solutions2Share app available in the Microsoft Teams store. This app allows you to easily integrate your intranet in Microsoft Teams and provide your users with a modern experience. Once the app is installed, it will be available to all users in the organization.
Here are the steps to add the Intranet by Solutions2Share app to Teams:
- Go to the Intranet by Solutions2Share app page in the Teams store.
- Click on the "Add" button to add the app to your Teams environment.
- Follow the prompts to complete the installation process.
- Once the app is installed, you can configure it to show your SharePoint site by following the app's documentation.
Test result in my environment:
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