Microsoft project management software used to plan, manage, and communicate a project schedule and other information among workgroup members, project managers, and other stakeholders.
JoC61 --
Your problem is caused by storing your projects in SharePoint. There are certain features in Microsoft Project that simply do not work for projects that are stored in either SharePoint or OneDrive. Features that do not work include, but are not limited to:
- Using a shared resource pool file
- Creating and using a master project
- Setting cross-project dependencies
I am sorry to deliver the bad news, but the only way to resolve this problem is to store the project files in a network folder or on your laptop. Hope this helps.