Error adding new event to google calender Google_Service_Exception (401) { "error": "unauthorized_client", "error_description": "Unauthorized" } - laravel

Question

When i try to submit a new event to my google calender in a laravel project I always face this error:
Google_Service_Exception (401)
{ "error": "unauthorized_client", "error_description": "Unauthorized" }
I created new OAuth credentials for calendar api and added it to .env file as shown:
I am also using google+ api so that each user can access his calender to update his events via OAuth 2
I tried to add new OAuth credentials but the problem still persist I also tried to delegate domain-wide authority to my service account by adding client id added to the .env file & scope and authorize them but nothing changed I also waited for 24 hours waiting the changes to take place but also nothing changed
Here is the function am using to create new events:
public function doCreateEvent(Event $evt, Request $request)
{
$this->validate($request, [
'title' => 'required',
'calendar_id' => 'required',
'datetime_start' => 'required|date',
'datetime_end' => 'required|date'
]);
$title = $request->input('title');
$calendar_id = $request->input('calendar_id');
$start = $request->input('datetime_start');
$end = $request->input('datetime_end');
$start_datetime = Carbon::createFromFormat('Y/m/d H:i', $start);
$end_datetime = Carbon::createFromFormat('Y/m/d H:i', $end);
$cal = new \Google_Service_Calendar($this->client);
$event = new \Google_Service_Calendar_Event();
$event->setSummary($title);
$start = new \Google_Service_Calendar_EventDateTime();
$start->setDateTime($start_datetime->toAtomString());
$event->setStart($start);
$end = new \Google_Service_Calendar_EventDateTime();
$end->setDateTime($end_datetime->toAtomString());
$event->setEnd($end);
// Create new conference
$conference = new \Google_Service_Calendar_ConferenceData();
$entryPoint = new \Google_Service_Calendar_EntryPoint();
$entryPoint->setAccessCode('wx12z3s');
$entryPoint->setEntryPointType('video');
$entryPoint->setLabel('meet.google.com/wx12z3s');
$entryPoint->setMeetingCode('wx12z3s');
$entryPoint->setPasscode('wx12z3s');
$entryPoint->setPassword('wx12z3s');
$entryPoint->setPin('wx12z3s');
$entryPoint->setUri('https://meet.google.com/wx12z3s');
$conference->setEntryPoints($entryPoint);
$conferenceSolution = new \Google_Service_Calendar_ConferenceSolution();
$conferenceSolution->setIconUri(null);
$conferenceSolution->setKey(new \Google_Service_Calendar_ConferenceSolutionKey());
$conference->setConferenceSolution($conferenceSolution);
$conferenceRequest = new \Google_Service_Calendar_CreateConferenceRequest();
$conferenceRequest->setRequestId($request->_token);
$conferenceSolutionKey = new \Google_Service_Calendar_ConferenceSolutionKey();
$conferenceSolutionKey->setType("hangoutsMeet");
$conferenceRequest->setConferenceSolutionKey($conferenceSolutionKey);
$conferenceRequest->setStatus(new \Google_Service_Calendar_ConferenceRequestStatus());
$conference->setCreateRequest($conferenceRequest);
$event->setConferenceData($conference);
//attendee
if ($request->has('attendee_name')) {
$attendees = [];
$attendee_names = $request->input('attendee_name');
$attendee_emails = $request->input('attendee_email');
foreach ($attendee_names as $index => $attendee_name) {
$attendee_email = $attendee_emails[$index];
if (!empty($attendee_name) && !empty($attendee_email)) {
$attendee = new \Google_Service_Calendar_EventAttendee();
$attendee->setEmail($attendee_email);
$attendee->setDisplayName($attendee_name);
$attendees[] = $attendee;
}
}
$event->attendees = $attendees;
}
$created_event = $cal->events->insert($calendar_id, $event);
$evt->title = $title;
$evt->calendar_id = $calendar_id;
$evt->event_id = $created_event->id;
$evt->datetime_start = $start_datetime->toDateTimeString();
$evt->datetime_end = $end_datetime->toDateTimeString();
$evt->save();
return redirect('/event/create')
->with('message', [
'type' => 'success',
'text' => 'Event was created!'
]);
}
I am using a G suite account so that I can add events and assign hangout meet conferences to it but the problem keeps showing when i try to add newly created event to the user calender

Answer 1

The problem was the access token I am trying to use to access user calendar is wrong. When I deleted all user data and of course his access token saved to the database and tried to login again so that a new record created to the user with a new access token the problem solved and I can now access his calendar and create new events