Hi @Anonymous ,
Thank you for posting query in Microsoft Q&A Platform.
Any specific reason for going with webhook activity here?
You can consider using Web activity in this case. With web activity it will work.
Please check below screenshot where same API call which in question tried with Webhook and web activity. You can see web activity is successful and web hook activity for timeout. For the webhook activity to work API should have logic implemented to intimation back to webhook activity saying request processed successful with Callback URL. Hence consider web activity is right choice here.
Hope this helps. Please let me know if any further queries.
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