How to overwrite session value in Laravel 5.8?

I have a feeling that my Session::flush() is not getting flush.

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Code

...codes ... 

$user = User::where('uuid',$refreshTokenResult['uuid'])->first();
$user->accessToken  = $refreshTokenResult['access_token'];
$user->save();

Session::forget('user');
Session::flush();
Session::save();
Session::put('user', $user);

...codes ... 

I thought we suppose to use only this Session::flush();. In addition to that, I even tried Session::save();.

It produces the same result.

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Result,

Because of that my Session::get('user') will have old data like token, etc, then, I can NOT call any APIs because the token used was expired.

Any hints on how to debug this further?

via Chebli Mohamed