SharePoint lookup columns and lists haven’t completely been replaced by the managed metadata service on SharePoint. Using them on a Nintex Form and processing the output is easy, once you know how.
When you get the value of a person via Nintex Workflows, you often get a bit of a messy string back – it starts with “i:0#.f|” and may also be “i:0#.f|membership|” . That string is the claims token. Here’s how to get rid of it using the Regular Expression action on Office 365.