It'll fail, and the mod trying to migrate will get grumpy.
If it looks like an obvious attempt to get around a question ban, you would have to deal with whatever the mods on the site you posted on decide to.
At best it'll get closed. At worst, you get a mod message or a suspension.
If its a single honest mistake, meh. No big deal
In most cases the ...
Even moderators can't migrate questions to sites where you're question banned. Otherwise it would just be a loophole people would exploit to get round the ban. You need to get out of the ban first.
If ask for impossible migrations repeatedly knowing you are banned the source site mods will be less than impressed and likely do something to stop you. If not ...
I personally don't need this at the cryptography site. Maybe we can enable such usage upon request? I'm personally not happy at all if such a list can be downloaded. I would hope that the email addresses can be at least kept within a browser window instead. That makes it less likely that the mail addresses are found on somebodies discarded hard disk.
I never seen such leak to date, and probably as moderator sign a NDA clause and legally it can be a problem if a leak happen under their name.
but.. I think another path exist. It’s not the tool the problem IMO, but what would be nice to protect against, is an account take over, as such could lead to such leak.
To prevent that SE could ask mod for a 2FA ...
More of an addendum:
Isn't an option at all for "real" accounts. You provided your content here, and SE Inc. can't just come in and unilaterally deny you access to your content/profile information.
And because of that, you will find a few users here or there with multi year suspensions.