Microsoft Teams cross team links

MindManger might help see an overview of multple projects, possibly replacing 'Planner' in Teams as it has a KanBan view. But ...

I have an overview 'team' for several projects, each project has its own team and Plan. I cannot work out how link to the project mind maps from the overview mind map. Not from MindManager desktop or from mindManager in Teams. Typically it asks me to log into microsoft even though the computer itself is logged in. And/or it finds sharepoint and asks to download the file rather than open it in situ. Has anyone else managed this?