Customer Connector Error

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Posted on by ZK-07051304-0

Hi, I have a custom connector for an internal cloud application. This connector uses an API secret and key and is working fine in Power Automate. When I try to link it with the agent as a tool, it is failing with the error.

I have tried multiple suggestions from Copilot, but it is not fixing the issue and does not give the right results.

Error Message: Evaluating PowerFx expression resulted in error while invoking the connector : PVA.getAssetDetails failed: PowerFxJsonException Expecting String but received a Record Error Code: ConnectorPowerFxError Conversation Id: 23f2af4b-3ef2-43ca-a9a0-deac7b88ffdb Time (UTC): 2026-05-07T13:05:18.346Z

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Vahid Ghafarpour 817 on at

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It seems that your connector return object instead of string. Did you try to flatten the response to a string before use it. You can ttrace to find exact parameters that pass.

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OultonCollegeIT 21 on at

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use gemini reasoning for debugging, helped a lot to flat and fliter data before returning to copilot studio

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Prasad-MSFT Microsoft Employee on at

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This error means your custom connector’s action is returning a record/object (JSON object), but the agent or PowerFx expression is expecting a string value.
If the connector returns a record/object, use PowerFx to extract the specific string property you need.
Example: If the connector returns { "assetName": "Server1", "status": "Active" }, use PVA.getAssetDetails().assetName to get just the string.

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