UAC authentication problem

I'm posting to ask whether anybody can help me with this issue, basically my Managing Director has a business laptop which has fingerprint recognition configured as well as password authentication, the laptop is connected to our domain and the user is configured as a standard user in Active Directory and configured as a local admin on the laptop itself. Reason why we configured the user as a local admin on the laptop itself was so that the user was able to download, install and update programs such as iTunes on the laptop whilst he was offsite without requiring a network admin to download, install and update them for him, problem is the UAC won't let him use either his finger print or his password for his account in order to carry out these tasks without getting a network admin to carry out these tasks. Your help would be much appreciated.

Kind regards,

RocknRollTim

P.S. The laptop is a Dell Latitude 6430U and has NIS installed, if you require any further information to troubleshoot with please post.