In the Microsoft graph API - notificationUrl return 406 error

Suhel Inamdar 6

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

1 answer

Shivam Dhiman 6,056 Reputation points

2022-08-02T14:46:36.117+00:00

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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Gargi Biswas 1 Reputation point

2022-09-29T12:16:04.663+00:00

Using Django Framework where the webhook is hosted using ngrok

This is the web-hook code:

def work_easy_graph_webhook(request):
try:
validation_token = request.GET.get('validationToken')
if validation_token:
return HttpResponse(request.GET.get('validationToken'),
content_type="text/plain",
status=status.HTTP_200_OK,
)
except Exception as e:
print(f"Encountered exception: {e}")
return Response("Encountered Exception", status=status.HTTP_500_INTERNAL_SERVER_ERROR)

microsoft service tries to hit the webhook url but gives a 406 exception.

Not Acceptable: /graphs/work_easy_graph_webhook/
[29/Sep/2022 17:38:01] "POST /graphs/work_easy_graph_webhook/?validationToken=Validation%3a+Testing+client+application+reachability+for+subscription+Request-Id%3a+3e3374f2-0e66-4813-ab7a-7143bd86338e HTTP/1.1" 406 57

Tried setting the content-type and status code correctly. Nothing works. The error message from their end seems ambiguous.

The webhook url works through postman.

Any leads will be helpful

Gargi Biswas 1 Reputation point

2022-09-29T12:16:27.47+00:00

Subscription method:
def create_subscription(self):
payload = {
"changeType": "created",
"notificationUrl": f"{WEBHOOK_HOST}/graphs/work_easy_graph_webhook/",
"resource": "/me/mailfolders('inbox')/messages",
"expirationDateTime": "2022-10-01T11:00:00.0000000Z",
"clientState": str(settings.CLIENT_SECRET)
}
headers = self.build_headers()
response = requests.post(self.subscription_url,
data=json.dumps(payload),
headers=headers)
return response.json()

Shahriar XAHIN 11 Reputation points

2022-10-19T05:36:12.337+00:00

Did you find any solution?
I was working with this Subscription API on April this year and it was working. But now I can't get it to work
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In the Microsoft graph API - notificationUrl return 406 error

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