Hi Brad,
I had the same problem with a regular http site.
Google advised to add the website without the www. For that second one I could change the preferred domain.

Originally Posted by
bradz21
Hi Everyone, I was hoping someone might be able to answer a few questions for me. I'm having trouble for some reason in Google Webmaster Tools setting a preferred domain. After selecting the xhttp://www. selection, I receive this error:
"Part of the process of setting a preferred domain is to verify that you own xhttp://domainname.xxx. Please verify xhttp://domainname.xxx."
The sitemap and account are verified, when I check the verification section in webmaster tools this is what it says:
"Verification details
You're currently verified for xhttp://www.domain.xxx by the following methods: "
Do I somehow need to verify the website without the xhttp://www. ?
Also I when run a reverse lookup on my domain which is on a static ip address it shows two listings; domainname.net and xhttp://www.domainname.xxx . Is this correct or do I need to make some changes on the server?
Thanks for the help,
Brad
"Depend on the rabbit's foot if you like, but remember it didn't work for the rabbit." R.E. Shay