Teams Workflows webhooks: Is MessageCard payload support live?

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Posted on by MD-07011424-0

Context

Microsoft’s official Dev Blog on Retirement of Office 365 connectors within Microsoft Teams stated (update posted Oct 28, 2025) that by December 2025 Workflows webhooks would support posting MessageCard‑formatted payloads (so we wouldn’t need to reformat to Adaptive Cards). It also mentioned posting to shared or private channels. Blog URL: https://devblogs.microsoft.com/microsoft365dev/retirement-of-office-365-connectors-within-microsoft-teams/

Current issue (Jan 2026)

Despite the above, sending a legacy MessageCard JSON to a Teams Channel/Chat still doesn't seem available in Power Automate. A recent Microsoft Q&A thread also suggests there is no official confirmation that MessageCard support is live yet. https://learn.microsoft.com/en-us/answers/questions/5685899/status-of-legacy-messagecard-support-in-workflows

Questions

1. Is MessageCard payload support for Teams Workflows webhooks actually deployed? If yes, how can we create a workflow to utilize this feature?

2. If it’s not live yet, can we get an updated ETA or confirmation that the “by December 2025” commitment was rescheduled?

Categories:

Building flows

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GC-12022337-0 2 on at

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I've just created a new Workflow to test if a MessageCard formated webhook would alert to a channel.

Basic steps via MS Teams:

1. From the channel open ( ... > Workflows)
2. In Template search for "webhooks" and select "Send webhook to a channel"

3. Verify and Team and Channel and save workflow
4. After saving, this message shows up
Note: it states adaptive and message card payload support)

5. Copy webhook URL
6. Testing
a) MessageCard payload to the webhook (SUCCESS)
b) AdaptiveCard payload to the webhook (SUCCESS)

Optional: rename the workflow so its easy to identify in Teams or PowerAutomate (My Flows)

This is the workflow that is created and viewed PowerAutomate

And the Post card action parameters are like this.

Hope this helps

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TM-25021343-0 6 on at

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I followed the steps above but when I send message card format it fails and I get the following error: (Any ideas?) Thanks!

Action 'Post_card_in_a_chat_or_channel_1' failed: Microsoft.Azure.ProcessSimple.Data.Entities.Exceptions.ProcessSimpleDataException: The specified Teams flowbot adaptive card request is missing or invalid. The tracking Id is '{0}'. ---> AdaptiveCards.AdaptiveSerializationException: Property 'type' must be 'AdaptiveCard'
at AdaptiveCards.AdaptiveCardConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.DeserializeConvertable(JsonConverter converter, JsonReader reader, Type objectType, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
at AdaptiveCards.AdaptiveCard.FromJson(String json)
at Microsoft.Azure.ProcessSimple.Data.Components.AdaptiveCards.AdaptiveCardBuilder.DeserializeAdaptiveCard(String serializedAdaptiveCard, RequestIdentity requestor, CultureInfo cultureInfo, BotAdaptiveCardAtMentions atMentions) in C:\__w\1\s\src\processsimple\Roles\ProcessSimple.Data\Components\AdaptiveCards\AdaptiveCardBuilder.cs:line 930
--- End of inner exception stack trace ---
at Microsoft.Azure.ProcessSimple.Data.Components.AdaptiveCards.AdaptiveCardBuilder.DeserializeAdaptiveCard(String serializedAdaptiveCard, RequestIdentity requestor, CultureInfo cultureInfo, BotAdaptiveCardAtMentions atMentions) in C:\__w\1\s\src\processsimple\Roles\ProcessSimple.Data\Components\AdaptiveCards\AdaptiveCardBuilder.cs:line 934
at Microsoft.Azure.ProcessSimple.Web.Common.Validation.BotAdaptiveCard(String card, RequestIdentity senderRequestIdentity) in C:\__w\1\s\src\processsimple\Roles\ProcessSimple.Data\Common\Validation\BotValidation.cs:line 960

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TM-25021343-0 6 on at

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TM-25021343-0 6 on at

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Still have gotten no reply on this. Not understanding why this isn't working for me. Once note above mentions ""Send webhook to a channel". I actually don't even have that option. Mine is called "Send webhook alerts to a channel". Is that the same one am I missing an option? I can't be the only one having these issues?

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