Google Domains Github pages Enforce HTTPS — Unavailable for your site because your domain is not properly configured to support HTTPS

I have published a static site through github pages. I can access it through https://www.<sitename>.github.io. Now that I am trying to use a custom domain name provisioned through google domains, I cannot Enforce site access through HTTPS and get the following error Enforce HTTPS — Unavailable for your site because your domain is not properly configured to support HTTPS. I am using these IPs for setting up the custom domain record on google domain

1. 185.199.111.153
2. 185.199.110.153
3. 185.199.109.153
4. 185.199.108.153

Has anyone faced this situtation before? Would appreciate any insights into the situation