Have you ever been able to connect to SSAS cubes? Are your other non-extracted data sources able to connect and refresh? Can you try other database connections ie Oracle, SQL server etc
I am able to connect to SSAS cube on my tableau desktop , and this issues comes only after i publish to the server . Yes we have other reports connecting to OLTP which works on the server .
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Do you by any chance have an OEM version of Tableau Server? OEM's (folks who embed Tableau into their software) often will buy a more basic version of Tableau Server limited to three "types" of data connections (for example, Oracle, SQL Server Relational, and PostgreSQL). If SSAS isn't on the "list of 3" chosen by the folks who bought this server, you could see the message you've posted.
When in doubt I typically bounce the Tableau Server as well - just to make sure the licensing component hasn't gotten confused about something and just needs "another chance".