Hi @Varma
Have you encountered this problem when calling a Webhook to send a message to a channel?
Teams tag is mainly focused on the general issue of Microsoft Teams troubleshooting. According to your description, your question is related to Teams Development which is not in our scope. To better help you, we recommend adding the Teams Development tag to your post . The following suggestion is just for your reference:
You can troubleshoot the issue by entering your adaptive card at https://adaptivecards.io/designer/.
We found the same problem as yours in other forums. You can delete "weight", "normal" and "TextBlock" in the adaptive card in order to troubleshoot the problem. It seems the endpoint is now stricter applying the correct values and doesn't error out gracefully when things are not as expected.
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