Hi,
In order to be able to use third-party web services in Survey123, all requests to web services should use a proxy deployed in the Survey123 website to avoid CORS requests in Survey123 web forms. At least, it should be configurable.
Some servers don't allow CORS requests. There are no problems when using the Survey123 mobile app. CORS requests occur only with web forms.
ArcGIS Online is working fine with those third-party web services by the way. So I suppose requests are sent with a proxy. Please use same kind of solution for Survey123 web forms.
Thank you!
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