API v2 does operate differently than API v1, so the way you call it will be different. The URL https://api.dropboxapi.com/2/users/get_current_account is the right endpoint for getting the user's account information via API v2. You can find the documentation for it here:
We love to learn from the educators who use Dropbox. Whether you teach kids, teens, adults or a combination of all three, we want to know what apps and integrations you use with Dropbox to help with teaching. Which of the ones below is your favorite, or most used tool?