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In a GCC tenant, Copilot Studio currently doesn't support dynamic Adaptive Card JSON passed from Power Automate. As a workaround, I build the entire Adaptive Card JSON in a Compose action in Power Automate and pass it as a single string to Copilot Studio.
In Copilot Studio, use the "Ask with Adaptive Card" node, open the card properties, and replace the formula with just:
Topic.yourString
This renders the card properly, though it's not ideal. Hope this helps others running into the same limitation.
Please someone prove me wrong or tell me when GCC will get the feature?