If the incident owner is not defined where will be the incident gone?

Summary:

Firstly, I need to know if the employee raised an incident but doesn't tag incident owner, than which incident owner will get the notification regarding that incident.

Secondly, When there is 2 EHS Manager and they are raising an incident, each one of them is getting their incident in their own reported incident page which is located in safety Incident page in My client Group.

Please let me know as soon as possible