We are using webhooks to get events(create,update) from dynamics community to ICS , In the webhooks we have to use “webhook signature” for validation which is comes from request headers as per document (https://community.telligent.com/community/12/a/developer-training/c/webhooks ). Now web hook signature is not able get from redirect URL headers, Please check until that we have a blocker for validation.
Eg : string hashSignature = HttpContext.Request.Headers["X-Telligent-Webhook-Signature"];