Activating Skype Business / Lync with an Office 365 University account

Hi

I have a successful installation of Office 365 on my home computer.  This is a personal copy of Office purchased using an Office 365 University subscription

I have now been asked to use Skype Business / Lync for my University to make calls on their behalf.  I am providing my own device and software but would login to their Lync servers.

However, Skype Business is asking to be activated and wants a product key.  The key for my Office 365 subscription is not working.

Can I activate Skype Business using an Office 365 University subscription and if so how do I do this?

Many thanks

Iain