Graph Subscription API Error ValidationError

Question

I'm trying to call post API to create a subscription with this body, but returned ValidationError without any description. Can someone help me?

Answer 1

Hi Akbar Putra,

Thanks for reaching out.

The validation error suggests that your notification url is not able to respond to an endpoint validation request send by Microsoft.

Your notification endpoint should have provision for reading the validation token from the query parameters and return it back immediately.

Refer to the following link for more details

https://learn.microsoft.com/en-us/graph/api/subscription-post-subscriptions?view=graph-rest-1.0&tabs=http#notification-endpoint-validation

To know how a sample notification endpoint handles this validation request, refer to the link below

https://github.com/microsoftgraph/aspnetcore-webhooks-sample/blob/main/src/GraphWebhooks/Controllers/ListenController.cs

Code from line 67 - 69 handles the validation request

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Answer 2

Hi Akbar Putra,

Thanks for reaching out.

The Validation error usually comes when Graph is not able to validate the notification end point mentioned in the request body,

A request is sent by Microsoft in order to validate your end point and your endpoint must be capable of handling the validation request sent.

Your endpoint should read the validation token sent as query parameter and return it back immediately.

Kindly refer to the following link for more details

https://learn.microsoft.com/en-us/graph/api/subscription-post-subscriptions?view=graph-rest-1.0&tabs=http#notification-endpoint-validation

To know about a sample webhook refer to the following link

https://github.com/microsoftgraph/aspnetcore-webhooks-sample/blob/main/src/GraphWebhooks/Controllers/ListenController.cs

Code from Line 67 -69 on above link is handling the validation request

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".