[Bug]: The domain validation has failed. Make sure you have updated the DNS records for your domain.

### Problem description

My problem is that I can't connect a subdomain as a domain

### Steps to reproduce

1. Added the main domain - everything is fine, received a certificate - the site is working
2. Create a subdomain in SP Manager and add dns records
3. I'm catching a mistake "The domain validation has failed. Make sure you have updated the DNS records for your domain."

### Expected behavior

I would like to redirect to a subdomain

### Environment

_No response_

### Possible solution

_No response_

### Additional context

Perhaps I don’t yet know that Deploy does not allow such tasks to be carried out. I would appreciate your enlightenment!

The report names no source file, test, or entry point and provides no environment details. Start by reviewing the domain-validation flow for subdomains and reproducing the DNS setup described; done means the supported behavior is established and the validation failure or support limitation is documented.

Written by the indexing model from the issue text.