How do I assign a calculated field to a managed metadata field in SharePoint 2016

Hi all,

I have a content type form where I like to automatically extract the department code from Active directory and to assign it to the "Department code" which is a managed metadata field in SharePoint term store listing the department codes. I managed to use a calculated field to extract the dept code from AD but how do I assign it to the Department code field within the Nintex form?