410 - The requested page has expired

I'm getting a 410 share error. I use TinkerCAD classroom with my students. Students submit their share link as a URL into a class management system and then I check their work. However lately the URL's can't be opened. I receive a 410 error. I had a student demonstrate how she was creating the link and it was correct. Some other posts I have read mentions a sharing setting? Is that the fix setting the file to public? How do I ensure the student doesn't have the link set to private.


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