Missing required parameters exception, while param is filled in in URL - php

Question

I'm working on a Laravel project, where I have the following routes:
Route::group(['middleware' => ['web', 'auth'], 'prefix' => 'deliver'], function () {
Route::get("{pitch}/play", "DeliverController#play")->name("deliver.play");
Route::get('/', 'DeliverController#index')->name('deliver');
});
The route named deliver.play is being called like this:
<a href="{{ route("deliver.play", $pitch) }}">
<span class="glyphicon glyphicon-picture" data-toggle="tooltip" data-placement="top" title="Go to Playmode"></span>
</a>
As you can see, I pass the $pitch parameter to the route, however, on execution, the following error pops up:
ErrorException in UrlGenerationException.php line 17:
Missing required parameters for [Route: deliver.play] [URI: deliver/{pitch}/play].
Which normally means the {pitch} param isn't given, however, in the URL bar of my browser the param is there, giving me the complete URL of
http://localhost:8000/deliver/empty-pitch-13/play
So how is it possible for Laravel to not see the parameter im passing on to the route? Or is there something that I'm missing?
Thanks.
Edit:
I forgot to add the controller that the route links to. Here it is:
public function play(Pitch $pitch)
{
if ($pitch->hasPresentation()) {
$presentation = head($pitch->presentations);
return view("deliver.play.index", $presentation);
}
return redirect()->route('slides.create', $pitch);
}

Answer 1

Try this:
<a href="{{ route('deliver.play', ['pitch' => $pitch]) }}">
and add the pitch params to the function like so
Route::group(['middleware' => ['web', 'auth'], 'prefix' => 'deliver'], function () {
Route::get("{pitch}/play", "DeliverController#play", function($pitch){
//
})->name("deliver.play");
Route::get('/', 'DeliverController#index')->name('deliver');
});