Hello,
Currently, the Web Apps feature of Azure App Service is in compliance with PCI Data Security Standard (DSS) version 3.0 Level 1. PCI DSS version 3.1 is on our roadmap. Planning is already underway for how adoption of the latest standard will proceed.
PCI DSS version 3.1 certification requires disabling Transport Layer Security (TLS) 1.0. Currently, disabling TLS 1.0 is not an option for most App Service plans. However, if you use App Service Environment or are willing to migrate your workload to App Service Environment, you can get greater control of your environment. This involves disabling TLS 1.0 by contacting Azure Support. In the near future, we plan to make these settings accessible to users.
For more information, see Microsoft Azure App Service web app compliance with PCI Standard 3.0 and 3.1.
Please let us know if you have further questions.