Using Microsoft Graph I am successfully creating subscriptions, but when calling HTTP Patch to https://graph.microsoft.com/v1.0/subscriptions/ with a correct (works through Graph Explorer) json payload of { "expirationDateTime": "UTCTIME 2 minutes past current expiration"}
I always get 403 Forbidden as a result.
I have the permissions set (I think) correctly to Files.ReadWrite as per https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/api/subscription_update. These should be the same permissions as Creating the subscription so can someone help as to why I can create but not update?