Based on the information you provided, verify your original PC commander is still there. Once you've verified that, log out with the options in the launcher. Finally, log back in with the new account you created during the transfer. If the console commander is there, you're all set. If any of this doesn't work, create a support ticket here:
https://customersupport.frontier.co.uk/hc/en-us/requests/new
If everything works, take a look at
MinEDLauncher. It makes commander selection much easier, just create a shortcut for each one.
Note: On the setup instructions for MinEDLauncher, the shortcut example shows "profile-name". Use any name you want in place of "profile-name" (no spaces). That has no bearing on the actual account the shortcut is for. It's just to link the local shortcut to it's local authentication file.
Edit: Forgot the quote