Azure App Service Certificate. To access this, click on certificate configuration , and make sure there is a checkmark next to step 1: To create a free app service managed certificate:

The command will generate the mycertificate.pfx file, which you will need to upload in the azure app service. Key vault is an azure service that helps safeguard cryptographic keys and secrets used by cloud applications and services. The azure app service team is introducing app service certificates.
For a production web app, you may want users to see a custom domain name.
Troubleshoot domain and tls/ssl certificate problems in azure app service. In case of azure you will need to upload it to the azure portal. Azure app service customers can now purchase ssl certificates to use with variety of apps. Navigate to your created azure app service for example a azure web app.