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Quick fix

Edit ~/.claude.json to move PROXY_MANAGED into the approved list, or answer yes at the prompt.

Symptom

Section titled “Symptom”
Error output
Not logged in · Please run /login

Cause

Section titled “Cause”

Using cc-switch to give Claude Code a proxied model (GitHub Copilot or Codex, for instance), Claude Code detects the third-party API key and prompts `Do you want to use this API key?`. If you answer `no` by mistake, or the auth state handling misbehaves in cc-switch 3.16, `PROXY_MANAGED` gets written into the `rejected` list in `~/.claude.json`. Claude Code then refuses to use the proxy credential and reports not logged in. Some users hit a `400 bad request: Authorization header is badly formatted` error after editing the config, or find the edit has no effect at all — usually a compatibility regression in cc-switch 3.16.

Fix

Section titled “Fix”

  1. Open `~/.claude.json` in the current user home directory.

  2. Edit the `customApiKeyResponses` field, moving `PROXY_MANAGED` out of the `rejected` array into the `approved` array.

    // ~/.claude.json
    {
      "customApiKeyResponses": {
        "approved": [
          "PROXY_MANAGED"
        ],
        "rejected": []
      }
    }

  3. Restart Claude Code, and if the `Do you want to use this API key?` prompt appears, be sure to answer `yes`.

  4. If you get a `400 bad request` after the edit, or it still reports not logged in, downgrade cc-switch to version 3.15.

Affected Versions

Section titled “Affected Versions”
ToolClaude Code
Versioncc-switch 3.16.0 - 3.16.1
PlatformsWindows

Source Issues

Section titled “Source Issues”

This page is distilled from 2 real issues

FAQ

Section titled “FAQ”
I get `400 bad request: Authorization header is badly formatted` after editing `.claude.json`. How do I resolve it?
This is a known problem in cc-switch 3.16 — try downgrading cc-switch to version 3.15.
Why does switching to a DeepSeek model work and only Codex error?
This only happens with the proxy on and a model that needs OAuth authentication (Codex, GitHub Copilot). Other models are unaffected.
Section titled “Related problems”
Nothing happens, cannot sign in to the official channel - CodexUpgrade cc-switch to v3.16.2 or newer and delete the .codex and .cc switch folders in your home directory, fixing auth.json being overwritten.3 issues mergedBody text appears in thinking blocks, visible text nearly emptyUpgrade cc-switch to a build with PR #4210. Reactive thinking-placeholder handling fixes long-context freezes and body-text collapse.1 issues mergedAPI Error: 400 Param Incorrect Claude CodeUpgrade CC Switch to v3.16.2+ to fix 400 errors caused by missing reasoning_content in MiMo thinking mode.2 issues merged

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