We are facing control render issue, our lookup controls are not rending on Nintex froms for mobile version and Nintex Live
Getting Following issue :
Not sure but....if you want to publish your form on Nintex Live, that means users don't have access to your SharePoint.
So it could be normal, for security reasons, that lookup don't work : they're based on the fact that SharePoint data are accessed...wich should be impossible for external users.
Consider replacing lookups by standard choices (if your list doesn't change often)