All servers are located in the ONE domain, also the server on which the Power BI gateway is installed. There is a trusted domain called TWO.
Problem: I do not succeed in getting Power BI to work for users with an account of the TWO domain.
Error message: This report couldn't access the data source. Contact PowerBI, the author, to have it fixed.
Security on the datasource (Multidimensional Analysis services cube - live connection) works fine. The users can query the cube via Excel.
Mapping of the users in in the gateway is correct.
The report works fine for users with an account in the ONE domain.
What could be the cause of this problem?