The team administrator of your organization has the ability to add an owner to any proof that is owned by a user in the team.
Team administrators: Adding an owner
Step 1
In the main menu, select teams, then team dashboard.
The team dashboard will show you all proofs that your organization owns.
Step 2
Search for the proof you want to add an owner and click the i icon on the proof tile to open the info pane.
Step 3
Click the plus icon to add an owner to the proof.