If a user is banned from asking on a given site, the system will block migrations to that site of questions by the same user posted on different sites.
Additionally, the system allows question-banned users to ask one question on the site every six months, to give them another shot at getting out of the ban.
Putting these pieces of information together, there is one thing that's unclear: if a user is, for example, banned on site A but it's been more than six months since they last asked a question (and so they are temporarily allowed one question), they ask a question on site B, and site B migrates it to site A, will the migration be allowed, since the user is (temporarily) allowed to ask there, or will it still be blocked since the user is banned on site A (regardless of the 6-month allowance)?
The team has stated that migrations are only blocked if they would cause the rate limit to be exceeded, but I'm not sure if it applies to bans (i.e. the 6-month limit), only to the short rate limits that happen in advance of a ban.