Laravel Controller 2FA PGP dont generate key, find the error?

I have coded an Laravel 2FA PGP login using GPGME. I am sure I have installed GPGME correct!

After a User signs in, he gets a Message generated with PGP from his Public Key that he saved before.

But I just get always an empty field with no generated Key.

My Controller:

public function showDecryptionForm()
    {
      if(session()->has('user_name'))
      {
        $user_name = session()->get('user_name');
        $user_password = session()->get('user_password');
      }
      else
      {
        return redirect()->route('login');
      }
      $user_details = User::where('username',$user_name)->first();

      $secret = $this->generateSecretKey();

      $secret_hash = password_hash($secret, PASSWORD_BCRYPT);

      $this->secret_code = $secret_hash;

      //echo $user_details->pgp;

      putenv("GNUPGHOME =/home/.gnupg");
      $gpg = new gnupg();
      $key = $gpg->import($user_details->pgp);
      $gpg->addencryptkey($key['fingerprint']);
      $enc = $gpg->encrypt($secret);
      $gpg->clearencryptkeys();
      //echo '<textarea rows="30" class="form-control" name="pgp-msg">'.$enc.'</textarea>';

      session()->flash('secret_hash',$secret_hash);

      return view('auth.decryptionform',compact('enc','user_name','user_password'));
    }


    public function postDecryptionForm(Request $request)
    {
      if (Hash::check($request->decrypt_code,session()->get('secret_hash'))) 
      {
        if (Auth::attempt(['username' => $request->user_name, 'password' => $request->user_password]))
        { 
          $user = Auth::user();
          $user->last_seen = date('Y-m-d H:i:s', time());
          $user->save();
          return redirect()->route('home');
        }
      }
      else
      { 
        session()->flash('errormessage','Your PGP Decryption Code is Wrong!!!');
        return redirect('login');
      }  
    }
    public function generateSecretKey($length = 15)
    {
      $secret = '';
      for($i = 0; $length > $i; $i++)
      {
        $secret = $secret.rand(0,9);
      }
      return $secret;
    }
}

Blade:

   <label for="message">Public Key:</label>
   <textarea name="message" id="message" class="form-control" rows="15" cols="40" readonly></textarea>
</div>
<div class="form-group">
  <label for="decrypt_code">Please Enter the Message:</label>
  <input type="text" name="decrypt_code" id="decrypt_code" class="form-control">

Have I forgotten something to print the code in my script?

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