Attempt to read property "secret" on null

Question

I'm trying to develop my first webapp with Laravel so I can practice a bit but I've hit a roadblock right at the beginning. I didn't find anything on google regarding this problem, and I already tried to test this in a fresh install. I'm using Laravel 11 and passport auth. The user "artist" is created but I always get this 500 internal server error for some reason with the message "Attempt to read property "secret" on null". I can't really figure this out so I'm trying my luck here hoping someone has solved this issue.

Whole trace is here

AuthenticationController.php

    public function register(Request $request)
{
    
    $validatedData = $request->validate([
        'name' => 'required|string|max:255',
        'email' => 'required|string|email|max:255',
        'password' => 'required|string',
    ]);

    // Hash the password before saving it to the database
    $validatedData['password'] = bcrypt($request->password);

    $artist = Artist::create($validatedData);        
    
    if (!$artist) {
        return response()->json(['error' => 'Failed to create artist.'], 500);
    }

    $token = $artist->createToken('Token Name')->accessToken;

    return response()->json(['token' => $token]);
}

api.php

Route::post('/register', [AuthenticationController::class, 'register'])->name('register');

ArtistController.php

public function store(Request $request)
{
    $validatedData = $request->validate([
        'name' => 'required|max:255',
        'email' => 'required|email|unique:artists',
        'password' => 'required',
        'description' => 'nullable',
        'genre' => 'nullable',
        'url' => 'nullable',
        'image' => 'nullable|image|mimes:jpeg,png,jpg,gif,svg|max:2048', // Add this line for image validation
        'tags' => 'nullable',

    ]);

    $imagePath = null;

    if ($request->hasFile('image')) {
        $image = $request->file('image');

        if ($image->isValid()) {
         
            $imageName = time() . '.' . $request->image->extension();
            $imagePath = $request->image->storeAs('public/images', $imageName);
            $imagePath = str_replace('public/', '', $imagePath);
        } else {
            return redirect()->back()->withErrors(['image' => 'The uploaded image is not valid.']);
        }
    } 

    $artist = new Artist();
    $artist->name = $validatedData['name'];
    $artist->description = $validatedData['description'] ?? '';
    $artist->genre = $validatedData['genre'];
    $artist->url = $validatedData['url'];
    $artist->image = $imagePath;
    $artist->tags = $validatedData['tags'];
    $artist->save();

    return redirect()->route('artists.index')
        ->with('success', 'Artist created successfully.');
}

PersonalAccessTokenFactory.php

protected function createRequest($client, $userId, array $scopes)
{
    $secret = Passport::$hashesClientSecrets ? $this->clients->getPersonalAccessClientSecret() : $client->secret;

    return (new ServerRequest('POST', 'not-important'))->withParsedBody([
        'grant_type' => 'personal_access',
        'client_id' => $client->getKey(),
        'client_secret' => $secret,
        'user_id' => $userId,
        'scope' => implode(' ', $scopes),
    ]);
}

Response

"message": "Attempt to read property \"secret\" on null",
"exception": "ErrorException",
"file": "C:\\...\\PersonalAccessTokenFactory.php",
"line": 97,

Thanks in advance and please let me know if I can provide with some more code.