Sharepoint webhooks - Failed to validate the notification URL

Question

Hi&nbsp;im trying to create a webhook via our Sharepoint 365&nbsp;https://tenantname.sharepoint.com/sites/Test_Site/_api/lists/GetByTitle('Documents')/subscriptions&nbsp;{&nbsp;&nbsp;&nbsp;&nbsp;"resource":"https://tenantname.sharepoint.com/sites/Test_Site/_api/lists/GetByTitle('Documents')",&nbsp;&nbsp;&nbsp;&nbsp;"notificationUrl":"https://somecloud.com/AppFormAPI/rest/v1/notifications",&nbsp;&nbsp;&nbsp;&nbsp;"expirationDateTime":"2022-11-06T17:27:00.0000000Z"}&nbsp;for some reason sharepoint gives back&nbsp;&lt;?xml&nbsp;version="1.0"&nbsp;encoding="utf-8"?&gt;&lt;m:error&nbsp;xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"&gt;&nbsp;&nbsp;&nbsp;&nbsp;&lt;m:code&gt;-1,&nbsp;System.InvalidOperationException&lt;/m:code&gt;&nbsp;&nbsp;&nbsp;&nbsp;&lt;m:message&nbsp;xml:lang="en-US"&gt;Failed&nbsp;to&nbsp;validate&nbsp;the&nbsp;notification&nbsp;URL&nbsp;'https://somecloud.com/AppFormAPI/rest/v1/notifications'.&lt;/m:message&gt;&lt;/m:error&gt;&nbsp;My postman can trigger the endpoint though so we're not sure where to look.

svensieverding · Answer

It seems like SharePoint cannot validate the Webhook.
Does your Endpoint return the validationtoken within 5 Seconds, i.e.

POST https://somecloud.com/AppFormAPI/rest/v1/notifications?validationtoken={randomString}

returns {randomString}

robelliott · Answer

gonxman&nbsp;I think it should be getByTitle, not GetByTitle

gonxman · Answer

Endpoint returns with randomString within 5 secs when tested with Postman. But the Add Subscription call still fails with a 400 Bad Request.

gonxman · Answer

just changed this but still a 400 Bad Request and "Failed to validate the notification URL"

nicolaskheirallah · Answer

You need to have a subscription: https://learn.microsoft.com/en-us/sharepoint/dev/apis/webhooks/lists/overview-sharepoint-list-webhooks

https://learn.microsoft.com/en-us/sharepoint/dev/apis/webhooks/lists/create-subscription

Forum Discussion

Sharepoint webhooks - Failed to validate the notification URL

Share

Resources