Not able to create calendar events webhook

I am trying to create a subscription for calendar events. But I am getting 400 error with message containing:

"code": "InvalidRequest",
"message": "Subscription validation request failed. Must respond with 200 OK to this request."

As per webhook validation doc my server should have received call on notificationUrl passed in subscription post body, which is not happening for some reason. I can confirm this same POST notificationUrl could be accessed by me and it accepts validationToken as query param.

Can someone please help here.

Thanks

Kushal

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Kushal Chokhani

Managed to resolve after checking access logs. Validationtoken request was getting blocked with 415 error because my api was only accepting json. Ensured that it can also accept "text/plain" and it is now working.

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Huni Shen MSFT

Hi Kushal,

The subscription notification endpoint (specified in the notificationUrl property) must be capable of responding to a validation request as described in Set up notifications for changes in user data. If validation fails, the request to create the subscription returns a 400 Bad Request error.

Here is an article for your reference: https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/api/subscription_post_subscriptions

If the above article doesn’t help you, since this problem is a code related issue, we recommend you to contact the dedicated MSDN forum to get targeted assistance:

https://social.msdn.microsoft.com/Forums/en-US/home

Best Regards,

Huni

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Not able to create calendar events webhook

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