Trying to list all my onedrive root entries

Hello, I created in php a class that makes an Graph Client (Creates access token and appClient).

I'm trying to create a GET request to list all my onedrive root (files and folders) with this endpoint:
GET https://graph.microsoft.com/v1.0/users/{user-id}/drive/root/children

This GET request work in POSTMAN but not in my own php code:
$response = $this->appClient->users()->byUserId($this->user_id)->drive()->root()->children()->get($configuration)->wait();

The $configuration is a new DriveRequestBuilderGetRequestConfiguration().
Perhaps I'm using the wrong Import?

Thank You,
Gilad Segal