When installing Unified Communications Diagnostics you may receive the error:
The SQL Authentication credentials could not be verified
Error code = -2147217843
Error message = IDispatch error #3149
Error source = Microsoft OLE DB Provider for SQL Server
Error description = Login failed for user 'USER'
Source = Microsoft OLE DB Provider for SQL Server, Desc = Login failed for user 'USER'., SQL state = 42000, Native error =18456, Error = -2147217843
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