Please provide more information related to your situation. I am able to publish the attached XLSForm using the latest version of Survey123 Connect (2.8) without error. Answers to the following questions would be helpful...
1. What version of Survey123 Connect are you using?
2. Does the error occur after attempting republish an existing survey?
3. If so, what changes were made from the original? (Consider downloading the XLSForm of the currently published survey and uploading it to this thread)