You can add all SharePoint Online sites in the tenant, all SharePoint sites that are associated with Microsoft Teams, or all project web app sites to a SharePoint Online app.
To add Project Online sites to the SharePoint Online app, ensure that you have a project license-enabled service account added to the app. You can add the service account from the app page, on the Configuration tab, in the SharePoint connection settings tile.
Procedure
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From the navigation pane, go to Protect > Office 365.
The Office 365 apps page appears.
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On the Apps tab, in the Name column, click the app to add the template to.
The app page appears.
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On the Content tab, click Add, and then select the category of sites that you want to add.
The Edit association dialog box appears.
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From the Office 365 plan list, select the plan to use for the sites.
If you are adding Project Online sites to the app, ensure that the plan has backup for Project Online sites enabled. For more information, see Enabling Backup for Project Online Sites.
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Click Update.