This script demonstrates how to retrieve delegate information in Office 365 Exchange Online. You can retrieve delegate information for multiple users with this script.
Currently, you can easily check delegate information in Outlook. However, you cannot check delegate information in Outlook Web App (OWA). If you only use OWA, a workaround is needed to mitigate this problem.
You can find more All-In-One Script Framework script samples at https://aka.ms/onescriptingallery