Gateway

Hi Anuka ,

when connecting to the data source, in Power Three authication Method Basic, Windows, or OAuth2.

For SQL Server, choose Windows or Basic (SQL Authentication). Enter the credentials for your data source.

If you selected OAuth2 authentication method:

• Any query that runs longer than the OAuth token expiration policy may fail.
• Cross-tenant Azure Active Directory (Azure AD) accounts aren't supported.

If you selected Windows authentication method, make sure that account has access on the machine. If you're not sure, make sure to add NT-AUTHORITY\Authenticated Users (S-1-5-11) to the local machine Users group.

Or are you using Personal gateway or Standard Gateway  ? 
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Hi Anuka ,

For Connection name.Customization, preferably clarifying the intent of the connection for ease of administrative use.

Server.You can right click on the AS properties in SSMS and find the name.

Database.When you have successfully connected, expand Databases, where the data model name.

Authentication method.Select your connection method and fill in the appropriate credentials.Please note The Windows account you enter must be a member of the Server Administrator role on the Analysis Services instance you're connecting to.

Finally,for map user names.Azure Active Directory (Azure AD) user name map a UPN in your local Active Directory instance.Refer to:Manage SQL Server Analysis Services data sources - Power BI | Microsoft Learn

Hope it helps!

Best regards,
Community Support Team_ Scott Chang

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