In a SharePoint 2013 list I have created a concatenated "Column"
Looking up a FedEx tracking number. “Trckg Number” in the list
=CONCATENATE("https://www.fedex.com/insight/findit/nrp.jsp?tracknumbers=",[Trckg Number])
It works but the result is not a link that you can select and get redirected to the FedEx web site.
In 2010 it returns a selectable URL and goes to the FedEx site. In 2013 it just reports the data and you need to copy it into a browser to get to the site.
Thank you for ideas...