Hi Costal,
Just for the future, please post questions and comments relating to Insider builds to the insider section of the forum. Different support people reply to that area of the forum.
Did you create the link to the data file in Excel for Mac or Excel for Windows?
What steps were taken when making the connection?
I would expect you would have had to set the data source up in the Mac OS ODBC manager application before the refresh would work, but maybe there's some other way to do it that I am not familiar with.