I'm having this same issue. Domain is not tied to my user id, it is cndltd.com and cnd.dgiss.co.uk. It's my understanding the account owner added cnd.dgiss.co.uk to the supported domains.
Suggestions?
I downloaded the installer and ran it on cnd.dgiss.co.uk (our dev environment). It seemed to work, but now if I go to EasyBlog from the components menu I see the EasyBlog Installer page and a failure on the Extracting Component Files step.
If I look at Joomla! updates, there is an update for toolbar, when I try to run it I get the above failure, with the "Invalid API Key provided" line in the file.