TL;DR

• create a connector of type: ‘incoming webhook’ to the teams channel you want to post to and copy the generated url
• create a curl command
• view your teams message

Create the connector (aka webhook)

• select the channel you want to create a connector for:

  

• add an ‘incoming webhook’:

  

• click add:

  

• name the connector (Note this name will appear in teams as the message sender)

• click ‘create’:

  

• copy the generated connector url:

  

Create the Curl command

set URL=https://outlook.office.com/webhook/1f53a159-15e1-4215-a345-31b004a1a5a9@d2449f56-cf6a-4196-87bc-aaaaaaaaaaaa/IncomingWebhook/a97a67eeac05428db5b9a4b5ba4cfa70/f58df943-e123-4a0d-b03b-bbbbbbbbbbbb

set DATA={""@context"": ""http://schema.org/extensions"",""@type"": ""MessageCard"",""text"": ""Hello from curl""}

curl.exe -XPOST -H "Content-type: application/json" -d "%DATA%" %URL%

Result

Thanks to my colleague Stu for the inspiration for this post