SOAP service call failing when I call using dynamic URL option

SOAP service call failing when I call using dynamic URL option

Version : 19.2 on cloud

when I call below url from "Call web service" as static it is working fine. but as WSDL is different for each environment I tried to call using dynamic option.

I have added the WSDL URL to constant and mapped the same to dynamic option. now when I click refresh services it is giving below error

Ex WSDL: abcd.xyx.com/.../Order_Create_Appian


Error when I clik on refresh button : The provided URL is not a valid URL format. Please provide a correct absolute URL to the WSDL. (APNX-1-4040-001)

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