Nintex Newbie

The User does not exist or is not unique error

I have a nintex form which interacts with a SharePoint Online list - all working fine until today, when the one form (for only 2 records) started giving several users a "Under does not Exist or is not Unique" error when the item is being submitted (please note that this is an existing item which is being edited and updated, not a new item being submitted.


Has anyone any idea why this is happening, and also what the fix is?

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