cheating 'uh error importing blogroll

This is bizarre as I've already tested this before and it worked, but not presently.

Trying to migrate a standalone site into multisite. Using the WP blogroll importer I'm getting the "cheatin' uh?" error although I'm currently logged in to the subsite as the superadmin.

Have done lots of searches about this but only find solutions related to other issues. Lost as to why a superadmin would be blocked from using this function.