What to do when domain was added but no SCA installed yet? After installing SCA domain is still in progress for several hours. I cannot delete to re-add it. Should filing a case with support is the only way?

Usually, the domain shows any error message like not setup correctly on the DNS provider but I have not run into the same issue, after a few hours it should display something and let you edit it. Otherwise go for the support case.

If they get stuck, you can either wait or request support for them to delete it. Quick tip: never create and depoy the domain if you didn't input the DNS records on your provider first. Otherwise they will ever get stuck