Hello @minhoo lee
Thanks for using Microsoft Q&A platform. Face API is not deprecated. Face service access is limited based on eligibility and usage criteria in order to support our Responsible AI principles. Face service is only available to Microsoft managed customers and partners. Use the Face Recognition intake form to apply for access - https://aka.ms/facerecognition
More references: https://azure.microsoft.com/en-us/updates/facelimitedaccess/
I hope this helps!