We are experiencing the same issue as reported here: https://community.powerbi.com/t5/Desktop/Users-with-multiple-security-roles-suddenly-can-t-see-data/m-p/2251588#M819234 The Power BI service i...
We are having the same issue as well.
If we open the modell in a older version of Power BI Desktop it works fine, but in the December version and in Power BI Service it throws a error relating to "SecurityFilteringBehavior=Both relationships".