Getting root domain SSL to work with G Suite, Google Sites, and Google Domains

I have Google's G Suite newly hooked up to a domain I'll call example.com

I have a Google Sites (a new-Google-Sites site) at an address like this:https://sites.google.com/example.com/example

I have the domain example.com held at Google Domains

I followed the directions here:

And set up custom url via the G Suite Admin panel such thathttps://www.example.com --> https://sites.google.com/example.com/example

It works through a CNAME record as described in the answer above:

www CNAME ghs.googlehosted.com

Right now typing any of the following into the browser ends up correctly showing the site (via https://www.example.com/):

• http://www.example.com/
• http://example.com/
• example.com
• https://www.example.com

BUT typing https://example.comdoes not work, and does not resolve or redirect to anything. I get this:

How do I configure this correctly?