In the Microsoft graph API - notificationUrl return 406 error

Question

I am using Microsoft Graph API(beta version), in that I wrote a webhook to create a subscription.
Endpoint:- https://graph.microsoft.com/beta/subscriptions
Request Body(Payload):- {
"changeType": "created",
"notificationUrl": "....webhook/you_have_microsoft_mail",
"resource": "me/messages",
"expirationDateTime":"2022-07-23T07:00:57.069804+00:00",
"clientState": "subscription-identifier"
}

So, it gives me error as a 400 Bad request with error message:- "Subscription validation request failed. Notification endpoint must respond with 200 OK to validation request."

I investigated issue further and I got the issue with NotificationUrl, it always return an error 406 not acceptable

But I tried same NotificationUrl with same token on the Postman, it works fine but with webhook it return 406 error

Answer 1

Hi @Suhel Inamdar

According to this documentation, error code 406 signifies "This service doesn’t support the format requested in the Accept header."
The "Accept" header field can be used by user agents to specify response media types that are acceptable.
Please ensure that you are using right content-type.

Hope this helps.

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