After you've shared a Project Online roadmap with an Office 365 group, you can change who you've shared it with. While you can’t remove the group you originally selected to share your roadmap with, you can add or remove members from the group.  

For more tips like this, check out the working remotely playlist at www.youtube.com/FoetronAcademy . Also, if you need any further assistance then you can raise a support ticket and get it addressed.