AutoHotkey simple script doesn't work when run from a shared folder connected by VPN

I have a simple script that runs from a shared folder on a server. When I run it from the same network where the server is, everything runs smooth, but when I'm not on the same network and I establish a VPN connection before running it, it returns an error message.

The script:

url = %1%
reservation = %2%
status = %3%
uid = %4%
ex_id = %5%

variables = {"id":"%reservation%", "status":"%status%", "uid":"%uid%", 
"ex_id":"%ex_id%"}

WebRequest := ComObjCreate("WinHttp.WinHttpRequest.5.1")
WebRequest.Open("PUT", url, false)
WebRequest.setRequestHeader("Content-Type", "application/json")
WebRequest.Send(variables)
Return

The error is 0x80072726 - An invalid argument was supplied. Specifically: Send

WebRequest.Send(variables)

Error Image Any help would be greatly appreciated because I'm stuck here.