<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Groups\Item\AcceptedSenders\Ref\RefRequestBuilderDeleteRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new RefRequestBuilderDeleteRequestConfiguration();
$queryParameters = RefRequestBuilderDeleteRequestConfiguration::createQueryParameters();
$queryParameters->id = "https://graph.microsoft.com/v1.0/users/{user-id}";
$requestConfiguration->queryParameters = $queryParameters;
$graphServiceClient->groups()->byGroupId('group-id')->acceptedSenders()->ref()->delete($requestConfiguration)->wait();