Via the Prism Owner Portal, owners will sometimes request access to horses in your stable if they are Owners of that horse. This is usually when they are syndicate members or 'other owners' not responsible for payments, and the manager of a syndicate has not provided you contact details of syndicate members.
Once they send the request, you will receive a notification advising of the request.
Click on the notification to see the request or view all Requests via the following: