We can transfer AppVeyor project to another AppVeyor account, not to GitHub account. It is like strictly typed :) So we need name of the target AppVeyor account. In many cases we do not ask this, because often it is easy to guess what AppVeyor account is linked to the specific GitHub account. In this case I am not 100% sure. I suppose it is AppVeyor account called AppVeyorDashAdmin, but need you to clarify.
Also we need to be sure that owner or admin of the target account is aware of this transfer. For that please request this move with email to team at appveyor.com and CC to the target account's owner.