Custom domain cannot be created if longer than 64 chars

[ntrp]

Hello, I am unable to create a custom domain if the subdomain contains dashes:

For example:

• creating a custom domain with an existing Route53 zone and a subdomain in the form service-euw1 fail with create failed and no details
• creating a custom domain with an existing Route53 zone and a subdomain like serviceeuw1 works as expected

[ntrp]

After further experimentation I figured out that the creating fails if the complete domain is longer than 64 characters. This is pretty limiting and should not be the like that..
In any case while it is like that it should either be documented or return a proper error instead of simply saying creation failed.