I'm the Company Admin (Company Plan) and I would like to be able to share existing boards with new non-team users. When I view the list of boards under a given team, I can click the ellipsis (...) on the right side and, for some of the boards, I have the option to Share. For others, I do not. What about some of the boards is preventing me from sharing. I should say that even for boards that I don't own, I'm able to share some of them.