I’m unable to update the webhook endpoint of Event grid subscription. I’ve created a new http triggered azure function and I’m trying to update the webhook endpoint point of an event subscription to this new function.

After update the endpoint and adding x-function-key in Header in Delivery Properties, I’m getting an error while saving it saying:

Deployment has failed with the following error: {“code”:”URL validation”,”message”:”Webhook validation handshake failed for https://eventgridl3functionapp.azurewebsites.net/api/eventgridl3functionapp. Http POST request failed with response code Unknown. For troubleshooting, visit https://aka.ms/esvalidation. Activity id:5dae7825-6144-4d9d-8adf-3b764bb6a7f7, timestamp: 8/8/2024 5:22:40 AM (UTC).”}

Could anyone assist me in debugging this?

I was able to update the event subscription webbook endpoint few days back and then I updated the http trigger function (removed some unnecessary logs from there) and now I’m unable to update the endpoint. Can I find specific error using the Activity Id?