While converting payload request as Activity Object from copiloat agents UI Im getting validation error

[Harish-ilink]

I am having azure bot which forwards that to aendpoint which is my backend code for the agent .Now while i am chatting from copilot agent UI .Im trying to deserialize the request payload json into activity object I am getting validation error .Since the Coploit payload and teams payload differ a bit

Code :
activity = Activity().deserialize(body)

Error:
[ERROR]: Validation error for Activity: 1 validation error for ValidatorCallable 2025-12-09 13:11:15 type 2025-12-09 13:11:15 Field required [type=missing, input_value={}, input_type=dict] 2025-12-09 13:11:15 For further information visit https://errors.pydantic.dev/2.11/v/missing (microsoft_agents.activity.activity:230)

[sarahcritchley]

Hi there! Thanks for raising the issue - could you provide a bit more/confirmation on what your doing - you mentioned Azure Bot - you referring to an Azure Bot Service record pointing at your api/messages? Can you share where your seeing the error e.g. when you are testing it in Teams, in M365 Copilot?

[Harish-ilink]

Hi @sarahcritchley I have azure bot configured in azure bot service which points my backend custom API logic in which i was using microsoft agents network for handling requests from Copolit agent UI I have added my appa in teams which is copilot enabled. While chatting from there i would get a payload that would reach my endpoint There i am trying to convert it into Activity object using this peice of code :activity = Activity().deserialize(body) and i was getting this error :[ERROR]: Validation error for Activity: 1 validation error for ValidatorCallable 2025-12-09 13:11:15 type 2025-12-09 13:11:15 Field required [type=missing, input_value={}, input_type=dict] 2025-12-09 13:11:15 For further information visit https://errors.pydantic.dev/2.11/v/missing (microsoft_agents.activity.activity:230)

[rodrigobr-msft]

To deserialize a JSON into an Activity instance, you must use:

activity = Activity.model_validate(body)

[Harish-ilink]

I have tried thisss it throw a pydantic validation error
2025-12-10 12:15:02 2025-12-10 06:45:02 [ERROR]: Validation error for Activity: 1 validation error for ValidatorCallable 2025-12-10 12:15:02 type 2025-12-10 12:15:02 Field required [type=missing, input_value={}, input_type=dict] 2025-12-10 12:15:02 For further information visit https://errors.pydantic.dev/2.11/v/missing (microsoft_agents.activity.activity:230)

[rodrigobr-msft]

An activity must have a "type" field. It cannot be empty. It looks like your code is attempting to deserialize an empty dictionary, which wouldn't make sense as an activity in the first place?

[Harish-ilink]

@rodrigobr-msft It is teams Copilot Activity .
Request Payload :
{
"text": "how much travel allowance i can get if i travel to US",
"textFormat": "plain",
"type": "message",
"timestamp": "2025-12-02T11:02:00.5138902Z",
"id": "",
"channelId": "msteams",
"serviceUrl": "",
"from": {
"id": "",
"name": "",
"aadObjectId": ""
},
"conversation": {
"isGroup": true,
"conversationType": "groupChat",
"tenantId": "",
"id": "]"
},
"recipient": {
"id": "",
"name": ""
},
"entities": [
{
"mentioned": {
"id": "",
"name": ""
},
"type": "mention"
},
{
"locale": "en-GB",
"timezone": "Asia/Calcutta",
"type": "clientInfo"
},
{
"id": "COPILOT",
"type": "ProductInfo"
}
],
"channelData": {
"tenant": {
"id": ""
},
"productContext": "COPILOT"
},
"locale": "en-GB",
"localTimezone": "Asia/Calcutta"
}

[rodrigobr-msft]

Here is a basic form of deserializing an activity

from a JSON str:

activity = Activity.model_validate_json('{"type":"message"}')

and from a Python dictionary:

activity = Activity.model_validate({"type":"message"})

Verify the type and shape of the body you are using, otherwise the deserialization will not work.