I hit an unexplained error while migrating, and the error page told me to go to https://help.mojang.com/ which has an expired TLS cert as of today.

Then I tried to submit a support ticket here: https://help.minecraft.net/hc/en-us/request/new?ticket_form_...

But when you click "Submit", nothing happens. I can see that their CORS config is broken and doesn't allow requests to zendesk's API.

I did eventually get my migration to go through. The trick was to enter my security question answers and click the button (where nothing happens, also a bug). Then close the tab and re-open it (control + shift + t).