SUB-528 when creating webhook

getting the following error when trying to create a subscription

{

"errorCode": "SUB-528",

"message": "[SubscriptionWebhook] application permission is required for [WebHook] transport",

"errors": [ {

"errorCode": "SUB-528",

"message": "[SubscriptionWebhook] application permission is required for [WebHook] transport",

"transportType": "WebHook",

"permissionName": "SubscriptionWebhook"

}

],

"transportType": "WebHook",

"permissionName": "SubscriptionWebhook"

}