How to include a variable into message of Teams Adaptive Card?

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Posted on by CU11060214-0

I'm using latest version of Copilot Studio and developing an agent Flow with action: Post a Teams adaptive card and wait for a response.

I would like to use my own variable with JSON code below:

"title": "Request Type:",
"value": "${requestType}"

But it keeps gave error message. Any buddy knows what should be the correct grammar?

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Calling actions from Copilot Studio

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Vish WR 3,507 on at

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@CU11060214-0

The ${requestType} syntax is the problem that's Adaptive Card templating, which Copilot Studio doesn't process, so it leaves it as literal text. Copilot Studio uses Power Fx instead.

In the card's Formula (Power Fx) editor, drop the ${} and reference the variable directly, no quotes:

text: "Request Type: " & Topic.requestType

Use Topic.requestType for a topic variable or Global.requestType for a global one, and join text with &. If the value comes from an agent flow, map the flow output to a topic variable first, then reference it the same way.

Reference (Microsoft Learn): https://learn.microsoft.com/en-us/microsoft-copilot-studio/advanced-proactive-message

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Nivedipa-MSFT Microsoft Employee on at

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Hello CU11060214-0,
${requestType} uses Adaptive Card templating syntax, and the "Post adaptive card and wait for a response" action does not evaluate it, so it shows up as literal text.

Instead, use Power Automate expression syntax:

Here are the variants based on the source:

Variable → @{variables('requestType')}

Trigger input → @{triggerBody()?['requestType']}

Previous action → @{outputs('ActionName')?['body/requestType']}

Tips:

Keep the double quotes around @{...} so the JSON stays valid.

If the value can be null: "@{coalesce(variables('requestType'),'')}"

If it isn't a string: "@{string(variables('requestType'))}"

The easiest approach is to click the value field in the action and choose the variable from the dynamic content panel — it inserts the correct @{...} for you.

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chiaraalina 2,318 Super User 2026 Season 1 on at

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Hi @CU11060214-0

The syntax depends on where you're creating the Adaptive Card:

In a Topic in Copilot Studio Native Cards when you use the"Ask with Adaptive Card" node directly:

Power Fx formula syntax

Make sure you choose Formula card as format and then you can reference the variable.

In Power Automate/Agent Flows with Post Adaptive Card and Wait for Response

Power Automate expression syntax

For example use use @{variables('variableName')} or also dynamic content.

The ${variableName} syntax you tried is part of the Adaptive Cards Template Language, which is a separate data-binding system for Adaptive Cards. For example when you author a card template then you can use it.

Hope it helps!

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