I was recently invited to create a Careers 2.0 account, and I find myself experiencing the opposite of this bug: I can link my top Stack Exchange accounts to my Careers profile just fine, but when I try to add top answers from some of those accounts, it says "Sorry, you don't seem to have any answers on that site. Choose another."
The issue seems to affect (mostly?) beta SE sites, but not all beta sites are affected. Specifically, some of the sites where this happens (with links to my profile there) include:
On the other hand, some beta sites are apparently not affected, including:
All the non-beta sites I've tried seem to be unaffected.
Pasting a link to one of my answers from those sites into the input box does work, or at least it did when I just tested it. However, I'm pretty sure that, when I tried it yesterday, it didn't work, but just said "The link you provided doesn't lead to a stackexchange answer by you. Please try again." even thought the links clearly did work in my browser.