It is not possible to migrate to Microsoft ... the message after pressing button "Get started" or "Migrate now" (in your email) is
WE’RE SSSSSSSORRY
We can’t find the page you’re looking for.
MC-248635
Not possible to Migrate
Resolved
Invalid
0
This report does not belong here. Issues with the minecraft.net and related sites should be reported to the Mojang Web Services project: https://bugs.mojang.com/browse/WEB