I am sorry. That change is necessary but not sufficient. With the new Expression data type, you also have to add associated Expression Role column property to indicate how the data in this column is to be used. The four roles that are available are Picture, Matrix, Expression, and Picture Expression. There is also the Event Handler column property, which is what I think you need to specify the action associated with a hyperlink. This is what the Using JMP guide has to say about the Event Handler property:
Use the Event Handler column property to define hyperlinks in a text column. The hyperlinks can be used to open web pages and other documents. Add the Event Handler to a column of URLs to open the URLs in a browser. (Hyperlinks to web pages in the text column must include “www”.) You can also modify the placeholder scripts on the column property to open different kinds of resources. For example, in a data table of geographical data, you might edit the Click script to display a Google map when the user clicks the hyperlink in the data table. The SAS Offices.jmp sample data table provides examples.