tried to follow answer in Question 41440803 but I'd like to find a way to post JSON message to an Incoming Webhook (no need for building a custom bot service), just invoking REST actions directly from my scripts.
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Updates: User mention in Incoming Webhook with Adaptive Cards
Check the answer from kostasvs: https://stackoverflow.com/a/69365035/576503
Only the Office 365 connector card format is supported over Incoming Webhook. Connectors do not support @mentions yet.

Wajeed Shaikh
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1It is now supportet see: https://stackoverflow.com/questions/61494475/mention-via-incoming-webhook-in-ms-teams-using-messagecard – Daniel W. Jun 08 '22 at 06:00