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 created a ticket with Microsoft.
They were aware of the problem and the internal product team is working on it to get it fixed, but we didn't get any ETA on when the fix would be released.