If you have requested a showing, but can not attend yourself. The appointment should be rescheduled.
As per Realcomp’s Lockboxes Policy Effective January 8, 2019:
“Lockbox access cannot be given to any other persons other than the individual expressly approved by the seller or listing broker and distribution of this access will subject the subscriber to a fine.”
Commentary: Lockbox access, once given to an individual authorized by the seller or listing broker, is not to be shared with anyone else. If an agent makes an appointment to show a listing and cannot make the appointment, he/she should cancel. If an associate of that agent decides to show the property, they should make their own appointment to do so.
In addition: If an Office Assistant is scheduling showing appointments for the agents in the office, please make sure the appointments are scheduled under the name of the agent who will be arriving at the showing.