Attempting to migrate a question on StackOverflow fails, at the moment.
Example: Java and JVM license
Cannot migrate via Close as Off Topic, or Migrate to Any Site.
Boy is this a circuitous one.
Recently, we started auto-awarding association bonuses. No longer will you have to disassociate/re-associate to gain a bonus, you'll get it once one account in the network passes 200 rep.
... except that when you crossed that boundary (<200 to >= 200) due to a migration things get funky*. For now, I've disabled the auto bit of association bonuses.
The automatic bonus code has been fixed, and will go out with our next deploy. Took a little longer than I'd hoped, because testing migrations is a pain; even more so when dealing with associated user accounts.
*Users from different DB contexts sitting next to each other makes things a bit funky, as a lot of our code assumes any given user is from the "Current" site/DB.