I have created an "Alias" field in my Contacts pages. I am trying to create a rule whereby,

1) When the record is updated

2) Update the "Alias" field
3) With the contacts Full Name. 

I have the rule working, as in it is updating the Alias field when edited, but I can't get it to pull the Full Name. I tried using ${Contacts.Contact Id} but it just displayed "${Contacts.Contact Id}" in the Alias field. 

Can I use tags like this? If so, what do I need? If I can't, does anyone have any other ideas?

Thanks, 

Martin