[BUG] When using Amazon Bedrock, a 403 error occurs and it cannot be used.

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I am using Claude Code via Amazon Bedrock. However, starting with version 2.0.8, this bug has appeared and it is unusable.

403 {"Message":"User: arn:aws:sts::XXXX:assumed-role/XXXX/XXXX is not authorized to perform: bedrock:InvokeModel on resource: 
      arn:aws:bedrock:::foundation-model/anthropic.claude-sonnet-4-5-20250929-v1:0 with an explicit deny in a service control policy"}

The configuration file is written as follows.

$ cat ~/.claude/settings.json
{
  "$schema": "https://json.schemastore.org/claude-code-settings.json",
  "env": {
    "CLAUDE_CODE_USE_BEDROCK": "true",
    "AWS_PROFILE": "XXXX",
    "AWS_REGION": "us-west-2"
  },
  "feedbackSurveyState": {
    "lastShownTime": 1754265830283
  },
  "alwaysThinkingEnabled": true
}

What Should Happen?

The value for region is not included in the values output to the log.

resource:
arn:aws:bedrock::${This is where the region should go}:foundation-model/anthropic.claude-sonnet-4-5-20250929-v1:0

It seems like AWS_REGION isn't being retrieved from the configuration file. Can you fix this?

The issue occurred in version 2.0.2, and while version 2.0.5 worked, the same problem persists in versions 2.0.8 and later.

Error Messages/Logs

Steps to Reproduce

1. Use version 2.0.8 or later.
2. Issuing the command results in an error.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.14

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_