Markdown Text Appears as HTML Tags When Posting to a Teams Bot

Question

Hello,

When I send a request to post markdown text to a Teams bot, the HTML tags are displayed as plain text instead of being rendered correctly.

Example Request:

curl -X POST "https://smba.trafficmanager.net/apis/v3/conversations/{conversationId}/activities" \
     -H "Authorization: Bearer ACCESS_TOKEN" \
     -H "Content-Type: application/json" \
     -d '{
           "type": "message",
           "text": "- test"
         }'

Message Posted by the Bot:

Other markdown formats are also converted into raw HTML strings.
I observed the same behavior when checking on both a web browser and the Windows mobile app.
Additionally, I explicitly included "textFormat": "markdown" in the request parameters, but the result remained unchanged.
My Teams client version is 49/25010620410.

Possible Causes

Do you have any insights into the cause of this issue? Some possible reasons I can think of include:

• Misconfiguration in the Teams app or bot settings
• Teams client settings
• Incorrect request method
• A bug in Microsoft Teams

Any guidance on this issue would be greatly appreciated.