Hi Nicole, No problem at all I appreciate the additional information. I've seen users have similar issues in the past. At the moment I'm wondering if you are encountering the same issue. In summary if records were created before editor tracking is enabled the 'modified_by' field may read NULL for these records. Any new records created after editor tracking was enabled will have this field populated. This conflict between NULL and populated records appears to cause issues when editing in Collector. I would recommend reviewing the hosted feature service for any NULL records in the 'modified_by' field. If these records exists enter a value for the NULL field. I hope this helps! Thanks, Thomas.
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