In our Azure subscription, we have three applications: dev.myapp.com, test.myapp.com, prod.myapp.com (www.myapp.com, myapp.com).
Previously, I just purchased a wildcard certificate, and then converted it to PFX format and uploaded it.
But I see now that I can get an SSL certificate directly from Azure, and save a bit of hassle. But I am wondering if I buy an S1 certificate, if I can use it with my subdomains, or if I need to buy the wildcard (which is quite expensive compared to getting it from another source).
I assume I need the wildcard and would just like to confirm.
sheamus,
I can confirm you'll have to buy a W1 Wild Card certificate: *.myapp.com.
A S1 Standard certificate will only cover your domain myapp.com (Upon submission the certificate will also be approved for www.myapp.com).
Also you can refer to the following Azure documentation:
Purchase, Store and Assign an SSL Certificate for your custom domain
If you need to secure multiple domain names, such as contoso.com, www.contoso.com, and mail.contoso.com, then you can get a wildcard certificate