Add a Free Azure SSL Certificate in EUM installed as App Service

1. Navigate to the App Service in https://portal.azure.com
2. Make sure pricing plan is B1 for the App Service
3. Free SSL cert can be added only for subdomains. So add a sub domain to the App Service.
4. To create a SSL certificate go to TLS/SSL settings
   
   
5. Go to Private Key Certificate tab and click Create App Service Managed Certificate
   
   
6. Fill up the form to create the free SSL certificate 
7. Go back to Custom Domains page and click Add Binding. 
8. Fill up the form to bind the Custom domain with the certificate

Related Article: Add Custom Domain to EUM App Service

Refer Microsoft Article: Add a TLS/SSL certificate in Azure App Service