They are able to receive the sharing email, and they are able to view the frame of the dashboard, however there is an X in each of the boxes. I'll post the detailed error they get in the morning. It says, something went wrong.. unable to load model schema...
ive seen these Xs before, when an internal users pro trial expires.. but then the service asks them to renew.. and that fixes it.
I will I'll say that the dashboard I tested today, never warned me about the pro content and going pro... which I feel is why the info is blocked.
i tried it just tonight by setting up a free powerbi account using my wife's work email address, and got the same error as my customers.
I have on prem data, I use the personal gateway, I have pro, and schedule auto refreshes.