Front Door Managed SSL for Apex Domain
While you can add an apex domain by changing your name servers to Azure DNS and utilizing an alias record (similar to traffic manager), front door does not allow for "Front Door Managed" SSLs for the apex domain. As this will be one of the most required SSLs (since it's very rare for a company not to redirect the apex to www.***.com or vice versa), it would be very useful to not have to purchase a cert for this purpose since free managed SSL is a very big selling point for Front Door. Please add this, otherwise almost all customer will still need to purchase an SSL for use with front door.
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Since a little while, Front doors now supports root domains. However, it does not support front door managed certificates on this frontend hosts. that would be nice to have.