Double wild card subdomain App Service certificate

Question

Hi Everyone,

I wonder if the existing Azure App Service wildcard certificate can support double or more subdomains ?

Example:
Wildcard Certificate: *.domain.com
Web AppsURL:

1. www.customer1-site.domain.com
2. customer1.test.domain.com

Reference: https://learn.microsoft.com/en-us/azure/app-service/configure-ssl-certificate?tabs=apex%2Cportal#start-certificate-order

Thank you.

Answer 1

@EnterpriseArchitect I want to offer my sincere apologies but my previous answer was wrong. I spent some time this weekend purchasing domains and certs to verify what was shared was accurate. In my sandbox, I encountered that multilevel wildcard certificates are not supported within Web Apps. This does not appear to be a limitation of App Service Certificates but a limitation of Azure App Services. If you try to secure a multilevel domain with a wildcard certificate, you will receive the error, "...Multilevel wildcard certificates are not supported."

This means you will need to use a standard certificate to secure each multilevel domain. If you have three multilevel domains, you will need three standard tier certificates to secure the domains.

If you purchased a wildcard domain based on my previous response and do not need it, please open a free billing and subscription case here within 30 days of purchase. They will likely ask you to delete the certificate and then they will submit a request to refund/credit you for the cost.

Let us know if you have any further questions or concerns.