Background: when question is migrated from site A to site B and the author doesn't have account in site B, their name will appear "gray" until they log in to site B and associate the accounts, then the avatar show and all is good. No problems here, same for answers and their authors.

Problem: if user from site A posted **comments** while the question was still in site A, their name will stay gray and unclickable **even after they logs in and have account in site B**:

![Screenshot][1]

[This is the above question][2], but most likely it's global problem, not specific to that one occurrence.


  [1]: //i.sstatic.net/Z5ILB.png
  [2]: //meta.stackexchange.com/questions/121043