Your ownership of the model's elements was relinquished by someone else on your project team.
Warning: Your ownership of the model's elements was relinquished by someone else on your project team. As a result, you cannot perform worksharing operations.
Issue: See Relinquish Elements in a Workshared Cloud Model.
Solution: It is recommended that you save your changes independently, close the model, and re-open the model from the cloud. You can copy your changes to the cloud version.