Unable to add new hostname for MySQL server

My domain example.org is hosted with DH. I have also setup a mirror domain example.dreamhosters.com

My problem relates to setting up MySQL databases. This works fine for example.com but, at this stage, I need to use a mirror instead rather for testing purposes. I am trying to get mysql.example.dreamhosters.com (the mirror domain) to point to my MySQL server. When I use “Add New Hostname”, it is initially accepted but never actually appears as a hostname for this server and does not get propagated into the DNS, even after waiting for some time.

Would anybody have any idea of the problem? Thanks for your help.

After getting in touch with the DH support team, it seems that there was a glitch in the system, and they are currently looking into it.