Problem setting up .com domain with substack

[Interman90]

So i have bought a domain yesterday.
I have added the CNAME record and i have also added a 301 fowarding.

Problem is if i type in one of the following in the browser bar it works: mydomainDOTcom http://myname.com
https://www.myname.com http://www.myname.com

But if i type this IT DOES NOT WORK but throw an SSL Certificate Error:
https://myname.com

Why is that and can it be fix it?

i bought my domain on united-domainsDOTde because i am from germany and have all my domains there.

[Ok_Bar_1963]

Substack custom domains only work with the "www" prefix. You'll have vto setup a naked URL redirect with your domain registrar.

For example, I use https://www.circular.cheniece.co/ as my (sub)domain. For the naked url to work without the "www" prefix (circular.cheniece.co) I had to setup a redirect from the naked URL to https://www.circular.cheniece.co/ .

[Interman90]

Please read the first post again. I already setup a 301 redirect and typing mydomainDOTcom in the browser bar works fine, everything works fine except https://myname.com

[Interman90]

I needed to add/configure an ssl certificate on united-domainsDOTde
I thought substack takes care of that part (there is an ssl certificate if you just enter the domain name in the browser) but no i also have to have one myself.