You cannot open the BIM file. Reason: You are not an Administrator on the workspace database server

Most of us might get this error message when we start to work on SSAS tabular model in client sides.

The solution is very straight forward but this can’t be solved by same login which is getting this error message. Contact the SQL Server administrator or use "sa" login and add your username under Sever administrators list in SSAS as shown below.

Cheers! Uma