Webhooks only works for admins?

[PatrikRalsberg1]

We have been using web hooks for a Survey123 for the form, including the images. We downloaded the images using the image URL and a web token provided in the data posted to the webhook.

This has been working for all our Survey123 users perfectly, but after ESRI's last upgrade of Survey123, we'll receive an "Code 400: This operatoin is not supported." instead of the attached image for ALL non-admin users. 

For Admin users, the webhooks still works, but of course we would like this to be working for all our Survey123 users.

Has anyone else got similar problem, and have you found a solution (without elevating the user's privileges to Admin?)

The full error message:
{ "error": { "code": 400, "message": "", "details": [ "This operation is not supported." ] }}

[abureaux]

Odd? My surveys are still sending, and I am the only real admin. We have several hundred submissions per day.

When I see that error message, it is either a random transient error that I ignore and it goes away, or more likely, it's related to connection timeouts. Have you tried refreshing all your Esri connections yet? Usually a good place to start.