We have had Office 365 Small Business account for quite some time - though no use of it until now:
Using Power BI: (pro free trial stage)
Created a report
Created a group
Created a content pack
Put the content pack into the group
Everything looks fine for me with Power BI Service
Sent email invitation to someone in group in my company via PowerBI - they received the email - followed the link - signed up for PowerBI - and now are in Office 365..... no sign of any Power BI Report....
?? what is needed for them to see the Power BI Report??....scratching our heads on this one.... all the Guided Learning is from the developer perspective and that works fine...no instruction on the perspective of someone receiving the email (at least that I've been able to find.....)