PowerShell : Invoke-RestMethod : The underlying connection was closed: An unexpected error occurred on a send.

Problem:

PS C:\My_Files\JiraSMS.ps1

Invoke-RestMethod : The underlying connection was closed: An unexpected error occurred on a send.

At C:\My_Files\JiraSMS.ps1:42 char:17

+     $response = Invoke-RestMethod -Uri $uri -Headers $headers

+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException

    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand


Resolution:
It's a TLS 1.2 problem, just follow the procedure on => https://baliwme.blogspot.com/2018/06/biztalk-configuring-biztalk-2013-server.html

Do not forgot to RESTART your PC/Server once done. :)