Thanks for your solution.  The first option is not viable (as it would have to be repeated every time a new user joins....  Seems to only highlight the complete lack of thought about the functionality QBO provides...- user can only share with none or all, but "all" is not all, and when new users join it's not "all" and can't be changed...... Seems the devs have gone out of their way to make this functionality unnecessarily complicated and unusable.

Re the second option - ie emailing it to them.  Does this only share an instance of the report and they then save their own version?  Or does emailing them give access to the shared report I've created and others are already using?