Microsoft Teams: How can I forward all messages sent to an Incoming Webhook to a Group Chat?

Given:

• I've configured an Incoming Webhook for a Microsoft Teams channel.
• I can use POST calls to programmatically post messages to this channel.

Question:

• I'd like to post these messages to a group chat. How can I do this?
• Can I (or should I) use Power Automate to intercept the messages sent to the Incoming Webhook (or channel) and forward them as is to the group chat?

You should use Power Automate. Teams Connectors are being retired in the next few weeks: https://devblogs.microsoft.com/microsoft365dev/retirement-of-office-365-connectors-within-microsoft-teams/

Here is a working Webhook sent from PowerShell. My application only supports top level JSON keys, so I am using the "text" key:

$WebhookUri = "https://prod-157.westus.logic.azure.com:443/workflows/..."


$adaptiveCardJson = @"
{ "type": "messagecard",
  "text": "Test 9" ,}          
"@
Invoke-RestMethod -Method POST $WebhookUri -Body $adaptiveCardJson -ContentType 'application/json'

Here is the Power Automate flow. You would change the "Post in" to "Group Chat".

Power Automate Flow