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Hi @Andrew Lu ,
Welcome to Microsoft Q&A!
I saw you snapshot, are you follow the Adventure Works Internet Sales tutorial (1200) to get star with SSAS? If yes, please change the Compatibility level to SQL Server 2016 RTM (1200) when you create a project, and then use administrator role to connect data source.
Please feel free to let me konw it work or not.
Best regards,
Carrin
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