This is as expected. The issue may be that if you are using the lat/longs that are in your data source, when you place them on the view, they are probably using the SUM aggregation. By right clicking on them (once they are on the view) and changing them to either dimensions or changing the aggregation to Average should cause the map to appear.
If this does not help, would you be able to post the workbook (twbx file) or the data file?
Not sure exactly what happened but my Lat & Long are working now - needed them to function as ungenerated dimensions to be recognized. I appreciate the assistance.
Thanks Tracy. I followed 'Right Click >>> Dimensions.
If you have a unique ID field, then put that field on Detail. Then Tableau knows which point is which.
Another solution is to choose Analysis > Aggregate Measures. That tells Tableau to treat each record as a separate point, rather than try to aggregate them.
Either one is probably a better representation of your data than making Latitude and Longitude dimensions.