Invoking MCP server through Copilot Studio throws a 404 after invocation

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#36 opened on Sep 11, 2025 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 25/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: azure
Domain: api, cloud

Research direction

Start by reviewing the APIM-exposed MCP server endpoint and the custom connector invocation in Power Automate. Compare the successful invocation with the 404 shown in Power Automate and Copilot Studio, using the attached screenshots as context. Done means the MCP response is displayed in Copilot Studio without a 404 Resource not found error.

Written by the indexing model from the issue text.

Description

We have an MCP server endpoint exposed on APIM and we created a custom connector in power automate and trying to invoke the same in copilot studio. We see that it is invoked successfully but a 404 Resource not found error is thrown before the response is displayed.

Please find the screenshots below for reference.

Invoking from power automate test tab shows the below error

Please advise whats missing.

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Forks: 77
Avg merge: 7d 12h
Merged PRs (30d): 7

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