Can't add a subdomain

hello (again!)
I was trying to add a subdomain (which I have previously deleted last night) and the error message is “Can’t add domain: already in our DNS system.” Clicked on the DNS screen of the domain name and I can still see the subdomain listed in the non-editable Dreamhost DNS records for the domain. This subdomain, however, is no longer listed in the Manage Domain. How can I add it again?
Thanks in advance.

Sometimes it takes awhile for it to update, but you can contact support and have them clear it out for you.

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