Got the same problem here, it's telling me that I've not linked my account but I have, if I check the portal link at the top of the page and choose MX accounts, the account is linked.
Same here, and until then i can't do anything.
When clicking "Click here to link them" i get a bunch of Visual Studio errors. So something isn't working entirely right.
I wish there was an unlink button so we could retry =) but i guess it's a lot more work.
Hopefully someone can help me out here.