Just migrated my accounts. If you are able to log into mojang but don't have access to the e-mail, change the email to one you do. It sends the activation to the new email. Hope this helps a few of you.
I know this is grave digging, but how would someone do that? With no security questions, I know the email and password just not the email it’s on
Thanks Drogo, here are the instructions for rank transfer for those who cannot migrate their accounts: Skyblock Official Site | Skyblock