OK, so I assume the link works though and your HTML must be correct.
Do you see the hand icon for other links in emails you receive? Email clients will process HTML however they want to, so some clients might simply not show a hand period.
You could also try adding css to the link such as
cursor:pointer; to see if that increases client support for the hand to show up.
cursor:pointer will work, or the client will automatically do whatever it will do for
<a> links by default. Not much else you can do. Email clients are notoriously bad at processing HTML consistently. You couldn't pay me enough to try and design an HTML email that will look exactly the same in every possible email client!