Copilot Code Review not using copilot-setup-steps.yml and ignoring MCP

[FSchmidt-Altus]

🏷️ Discussion Type

Bug

💬 Feature/Topic Area

Copilot Code Review

Body

I am trying to connect an MCP to Copilot Code Review (copilot-pull-request-reviewer). But I cannot get it to work.

I got the MCP working in Agent mode.

But during PR review it ignores the /.github/workflows/copilot-setup-steps.yml file.
During session init (Setting up environment) it lists the configured MCP server. But in the verbose logs during Processing Request it then logs:

MCP server "ado" has no allowed tools after filtering — omitting from config

It also ignores the COPILOT_AGENT_DEBUG setting.

If I disable the organisation policy 'Copilot code review' > 'Opt in to preview features' the filtering message disappears and also the Setting up environment in the session view. But my custom /.github/workflows/copilot-setup-steps.yml is never used for Code review.

No idea how to troubleshoot this further.

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