You cannot run this script on the current system. For more information about running scripts and setting execution policy

Could you please try below a

1. Install the module for all accounts: Installing to AllUsers places the module under C:\Program Files\WindowsPowerShell\Modules, which is visible to service accounts. Alternatively copy the module folder to that pathc

      # Run in an elevated admin prompt
      Install-Module -Name VstsTaskSdk -Scope AllUsers -Force
   

2. Check / adjust execution policy; in PowerShell:

      Set-ExecutionPolicy RemoteSigned -Scope Process