Get HTTP POST URL from flow

[jsv444]

I am trying to make a flow that is activated with a HTTP request reusable through multiple environments. But the HTTP POST URL is beeing changed at every import of the flow. I found out that you can use "list callback URL" and that works. But i want to do this through powershell and not through another flow.

I found that "Get-AzLogicAppTriggerCallbackUrl" cmdlet seems to generate the result i want. But the problem here is that i have a CDX test tenant without any subscriptions and resource group so i'm not sure what to use as ResourceGroupName and so on. Do you know where this url is stored? Is there a temporary resource group set up for these flows?