Thank you for reaching out. The issue you’re experiencing is often related to permissions or account ownership conflicts that need to be resolved before content can be transferred.
Could you confirm whether this error is occurring only with the original owner’s account who left the organization or with all users?
If it is specific to the original owner’s account, I’ve shared some steps with you in a private message. Kindly review those and respond there so we can assist you further.
Hope this helps.
Regards,
AN