Grant credentials are invalid

Hello, I've created an app using Laravel and I'm getting the error {"error":"invalid_grant","error_description":"Grant credentials are invalid"}. I have set the app's Access Level to Enterprise Access + app as per documentation. The code I am using in Laravel is:

$response = Http::asForm()->withHeaders([
'content-type' => 'application/x-www-form-urlencoded'
])->post('https://api.box.com/oauth2/token', [
'client_id' => '*********************************',
'client_secret' => '*********************',
'grant_type' => 'client_credentials',
'box_subject_type' => 'enterprise',
'box_subject_id' => '****************'
]);

In the dashboard, my enterprise ID is equal to 0, so I think I should use the user ID. Thank you very much for the help.

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