License Key is associated with another account

I'm trying to activate my Toolbox app. I have Parallels Desktop Pro Edition for Mac and use that key to try and activate Parallels Toolbox but toolbox says "This license key is associated with another Parallels account." I don't have any other account with them. I supposedly get email and phone support for as long as I have the subscription but nowhere on the site lists the support phone number or the support emails. The only phone number I can find is for their Seattle office and it is an automated system that tells me about the web site support and hangs up. Has anyone run across the problem I am having or know how to contact support directly - their canned info on the support web site is no help! Thanks in advance.