Because PHP 7.4 extended support on Windows will end on 28 November 2022, any applications hosted on Azure App Service that are still using it will be unsupported after 28 November 2022.
Recommended action
To minimize risk and potential security vulnerabilities, follow the steps to update your applications before 28 November 2022.
If you have questions, get answers from community experts in Microsoft Q&A. If you have a support plan and you need technical help, create a support request.