There's an option to add Project Online to a Classic site collection following the steps mentioned in this article https://docs.microsoft.com/en-us/projectonline/add-project-online-to-a-site-collection
According to this article > You can only add Project Online to a site collection that uses the Classic Team Site or Project Site template.
Is there also an option to add Project Online to a Modern Team site collection (being part of an Office Group)?
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Hello @Eric Deferm,
Unfortunately not, PWA requires the Classic site templates.
March 25, 2019