Laravel Service Provider “Unresolvable dependency”

I am having an issue that seems to be fairly common across the interwebs, but I'm afraid I can't pinpoint the solution.

Error

BindingResolutionException in Container.php line 888:
Unresolvable dependency resolving [Parameter #0 [ <required> $app ]] in class Illuminate\Support\ServiceProvider

Service Provider (Providers/SocialAccountServiceProvider.php)

Here is my relatively simple service provider.

namespace App\Providers;

use App\User;
use Socialite;
use App\SocialAccount;
use Illuminate\Support\ServiceProvider;

class SocialAccountServiceProvider extends ServiceProvider
{
    protected $socialNetwork = '';

    public function boot()
    {
        //
    }

    public function register()
    {
        //
    }

    public function resolveTwitterUser()
    {
        $this->socialNetwork = 'twitter';

        return $this->resolveUser();
    }

    public function resolveFacebookUser()
    {
        $this->socialNetwork = 'facebook';

        return $this->resolveUser();
    }

    public function resolveUser()
    {
        return $resolvedUser;
    }
}

Registration (config/app.php)

And I have registered the service provider with the app like so.

App\Providers\SocialAccountServiceProvider::class,

Controller (Controllers/TwitterAuthController.php)

My controller is quite simple as well.

use App\User;
use Socialite;
use App\SocialAccount;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use App\Providers\SocialAccountServiceProvider;

class TwitterAuthController extends Controller
{
    public function redirect()
    {
        return Socialite::driver('twitter')->redirect();
    }

    public function callback(SocialAccountServiceProvider $account)
    {
        $user = $account->resolveTwitterUser();

        if (Auth::loginUsingId($user->id, true))
            return redirect()->to('/');
        else
            return redirect()->to('/login');
    }
}

Would any kind souls be willing to help? 🙏

Deets: - Laravel: 5.4 - Socialite: 3.0

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