Hello,
Probelm description:
1. user has Office 365 Academic A2 licence for Lync Online (Plan 2)
2. User can login to portal.onmicrosoft.com and download Lync desktop application
3. After the instal is over, user starts Lync
4. User hat to activate
5. User is not able to activate
Acorgind to this: http://technet.microsoft.com/en-us/library/lync-online-service-description.aspx
at the bottom there is this note for Lync 2013 „The exception is Office 365 Education A2, which does include the Lync 2013 client...“
user should be able to use Desktop version of Lync, but they can't.