Laravel E-Mail verification always unauthenticated

Hello everyone,

I have a problem with E-Mail verification. I followed all the steps from the Laravel 11 documentation to set up the verification. Only difference is, that I do not use Blade, but a ReactJS (currently simulated by Postman) frontend. I got everything working, until the link has to be clicked. Then it says message: unauthenticated.

This is what I have:

Routing

api.php

Route::get('/email/verify', [AuthController::class, 'notice'])->middleware('auth')->name('verification.notice');
Route::get('/email/verify/{id}/{hash}', [AuthController::class, 'verify'])->middleware(['auth', 'signed'])->name('verification.verify');
// Route::get('/email/verify/{id}/{hash}', [AuthController::class, 'verify'])->middleware(['auth:sanctum', 'signed'])->name('verification.verify');

SignUp, Notice, Verify

AuthController.php

public function signup(SignUpRequest $request)
{
    $data = $request->validated();
    $user = User::create([...]);

    event(new Registered($user));

    return response()->json(['user' => 'verification e-mail sent'], 201);
}

public function notice(Request $request)
{
    return $request->user()->hasVerifiedEmail()
        ? response()->json(['user' => 'mail sent'], 201)
        : response()->json(['user' => 'mail error'], 401);
}

public function verify(EmailVerificationRequest $request)
{
    $request->fulfill();
    return redirect()->away(www.domain.com);
}

As I understand, the auth and signed middleware should allow me to access the /email/verify/{id}/{hash} route even if I am not logged in. But somehow I get an unauthenticated message if I try to verify the link in Postman.

I tried to log the user in when he signs up and use auth:sanctum instead. But this only works, if I verify the mail on the same browser/Postman-instance as the SignUp. Which makes sense. But I want to allow verification from various devices.

Am I missing something? If you need more information, just tell me. Thanks for your tips and help in advance.