Using existing Office 365 AD with existing Azure

Hi all,

We currently have Windows Azure setup using our Microsoft Accounts, we now have Office 365 setup using ADFS (SSO, etc.) and therefore all have Organisational Accounts. I can see plenty of posts about adding a new Azure account to an Office 365 tenancy or the otherway round, but does anyone have any experience merging two existing subscriptions?

I've tried adding the Office 365 domain to Azure but it doesn't detect it as an existing domain in Office 365 and acts as if it's a totally new domain. Is the simplest thing to do to log a support ticket?

Thanks!