Power Platform Community Forum Thread Details

Attempting to migrate from the Microsoft Teams Office 365 Connector to Workflow before the deadline (https://devblogs.microsoft.com/microsoft365dev/retirement-of-office-365-connectors-within-microsoft-teams/) and creating a workflow using the 'Post to a channel when a webhook request is received' template (changing nothing from the default), I cannot find a working example of what JSON to post. Using Postman and several permutations of various schemas (Message, AdaptiveCard, etc), I'll either receive a 400 Bad Request or a semi-successful 202 response (some kind of cryptic internal error).

What is the expected JSON format (schema) for the POST message? Ultimately, I'll be using a template created by the online AdaptiveCard designer (attached sample adaptive card).