If you use extended properties incorrectly in a connection string in SQL Server 2016 Analysis Services, the stored connection strings become corrupted.
The issue is fixed in the following cumulative updates for SQL Server:
Each new build for SQL Server 2016 contains all the hotfixes and all the security fixes that were included with the previous build. We recommend that you install the latest cumulative updates for SQL Server:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminologythat Microsoft uses to describe software updates.