Android devices shows up in wrong account on Google Dashboard
The default account is the one that you logged in with first. If this was your Apps account and the "Remove account" option doesn't work than on a non-rooted device the only way to remedy this I to perform a Factory reset. However the device will still show up on your dashboard, I have devices I stopped using two years ago still there. 

One other thing to note is that your phone should show up on all accounts that you're logged in with. If it doesn't, try downloading a free app with that account.