I have a Router set up with accounts, and account/:account_id options. When the user lands on the index page of my app I transition them to the accounts route.
S
As your /:account_id is a resource you need to transitionToRoute 'account'. You also need an AccountRoute accordingly.
If /:account_id was a route not a resource you would transitionToRoute 'accounts.account' and your route handler would be called AccountsAccountRoute.