Action Custom connector working in Power Apps but not in Copilot Studio

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Posted on by OultonCollegeIT

I have multiple connector using API, and only 20% works

all of them work in PowerApps, using the Test mode

In copilot the input will go correctly, send the request. I can see the Hit on the other side of the API

but the response is bugging. I tried to play with the output field, looked at the code editor

different error code but mostly this one come back across multiple Api connectors

this one works in Power apps

but in Copilot will give this message

Sorry, something went wrong. Error code: SystemError. Conversation ID: 81139a1a-d116-47b5-9fc7-24ef07dcff96. Time (UTC): 4/30/2025 1:33:40 PM.

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Calling actions from Copilot Studio

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stampcoin 5,146 Super User 2026 Season 1 on at

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@OultonCollegeIT Hi

What authentication do you use for your connectors ?

Any firewall/policy against your API endpoint side ?

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OultonCollegeIT 16 on at

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@stampcoin, most are open API, some have a key, all our Public API. I don't see how the firewalls will block it as all is web interface, in Microsoft environment. I don't see any alert or blocking on my network

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stampcoin 5,146 Super User 2026 Season 1 on at

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@OultonCollegeIT Hi,

not sure if it needs initialize the connection or not . for example the MSN weather one.

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OultonCollegeIT 16 on at

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I tested with an open api with no authentification,

it prompt me to another page to connect, which we did connect and back to the page. But after the connection back to square one :(

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stampcoin 5,146 Super User 2026 Season 1 on at

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@OultonCollegeIT Hi,

Not sure if this link help or not.

https://learn.microsoft.com/en-us/microsoft-copilot-studio/configure-enduser-authentication

but it seems the authentication scope.

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OultonCollegeIT 16 on at

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no no luck, I have now 14 connectors and 50% works like a charm and 100% respond with a code 200 in Power apps. I added description in power apps connector in the response sample. It helps with the answer to me more tailored for the connector working. I have been flagging every error in the chat, hoping an engineer will look at it with all his benevolence.

So far API working in copilot studio

Wolfram alpha

random jokes ( i know..)

The Guardian Api

Socrata Api

Finnhub financial Api

CrossrefAPIConnector

not working in Copilot studio but working in power apps, I receive a system error

arXivAPIConnector

Health Canada DPD Connector

Medical Webster Dictionary - Get word definition

Open Canada API Connector

Springer Nature API Connector

World Bank

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