One of our release scripts that worked on TFS 2017 is not working on Azure DevOps 2019 SP 1.
There is a powershell script that runs remote commands on targeted machines (PowerShellOnTargetMachines.ps1). It is provided and part of the standard set of available pipeline tasks. You can see it here: https://github.com/microsoft/azure-pipelines-tasks/blob/master/Tasks/PowerShellOnTargetMachinesV3/PowerShellOnTargetMachines.ps1
When it goes to run this script it fails with the following:
[debug]Unable to create a environment object for given json - Unexpected character encountered while parsing value: A. Path '', line 0, position 0.
[debug]Microsoft.VisualStudio.Services.WebApi.VssServiceResponseException: Page not found.
[debug]Processed: ##vso[task.logissue type=error;code={"Task_Internal_Error":FaileToFetchResourceProperties};]
There is a recent Microsoft forum post about this issue, but that does not have any good answers. It actually suggests posting to StackOverflow.