When the assigned to is changed on Notification, "Users/groups in fields" on who will receive should receive a notification.
Only, assigned_to is receiving email, but not requested by.
Email Logs : Notification '<notification_name>' (fea0023e1b9d8810ced899b4bd4bcbec) excluded recipients because user created event but notification's "Send to Event Creator" setting is disabled: '<user_name>' (f8db3f291b8d7780115176e1dd4bcbc3)
Send to Event Creator is unchecked because the notification is viewed in a normal view. Once the form is viewed in Advanced View "Send to Event Creator" checkbox is visible.
We need to enable it to see the notification for Requested_by.
Send to Event Creator is unchecked because the notification is viewed in normal view. In Normal view of the notification, "Send to Event Creator" check box is invisible.
Enable "Send to Event Creator" check box by going to advanced view.