@Howell Yang Thank you for reaching out to us, As I understand you are looking for information on TLS 1.3 with Azure AD. Currently we support TLS 1.2 which is documented here - https://learn.microsoft.com/en-us/troubleshoot/azure/active-directory/enable-support-tls-environment?tabs=azure-monitor
You can share your feedback on feedback.azure.com which is monitored by our product group team - https://feedback.azure.com/d365community/search/?q=TLS+1.3
Let me know if you have any further questions, feel free to post back.