[BUG] Claude for Excel (Bedrock direct) selects `us.` inference profile when manifest `aws_region` is `eu-west-1`, causing 400/404 at `bedrock-runtime.eu-west-1.amazonaws.com`

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?

When the claude-in-office manifest is provisioned with aws_region: eu-west-1 for the Bedrock direct path, the add-in constructs invoke URLs of the form:

https://bedrock-runtime.eu-west-1.amazonaws.com/model/us.anthropic.claude-opus-4-7/invoke

This is an invalid combination. The us. cross-region inference profile only exists in and routes to us-east-1, us-east-2, and us-west-2. It is not resolvable from a bedrock-runtime.eu-west-1.amazonaws.com endpoint, so every request fails.

The root cause appears to be that the add-in's model selection logic is not region-aware: it picks a us.-prefixed inference profile regardless of the configured aws_region.

Why admins cannot work around this

Per the third-party platforms documentation and the claude-in-office manifest spec, admins can configure aws_region but cannot pin a specific inference profile ID. The add-in discovers and selects the model at runtime. That means this bug cannot be worked around through manifest configuration — it requires a code fix.

What Should Happen?

When aws_region is an EU region, the add-in should select a compatible profile:

• An eu.-prefixed geographic CRIS profile if one exists for the target model (e.g., eu.anthropic.claude-opus-4-6-v1 for Opus 4.6), or
• A global.-prefixed profile (e.g., global.anthropic.claude-opus-4-7) when no eu. profile exists and the source region supports global CRIS (eu-west-1 does).

Symmetrically for apac. / APAC regions.

Error Messages/Logs

Claude for Office connection failed (Bedrock)
Build: *****

400 The provided model identifier is invalid.

Request:
  aws_role_arn: arn:aws:iam::*********:role/ClaudeBedrockAccess
  aws_region: eu-west-1

Manifest params:
  m: unified-1.0.0.12
  aws_role_arn: arn:aws:iam::********:role/ClaudeBedrockAccess
  aws_region: eu-west-1
  entra_sso: 1
  et: 

Bootstrap response:
  (not called)

Raw error:
400 The provided model identifier is invalid.

Steps to Reproduce

1. Run /claude-in-office:setup and configure the Bedrock direct path with aws_region: eu-west-1.
2. Ensure the signed-in AWS role has access to eu. and/or global. inference profiles in eu-west-1 (verified working via AWS CLI bedrock-runtime invoke-model).
3. Deploy the manifest and open Claude for Excel.
4. Sign in via Entra ID.
5. Any prompt fails with an invocation error against https://bedrock-runtime.eu-west-1.amazonaws.com/model/us.anthropic.claude-opus-4-7/invoke.

Expected Behavior

The add-in selects an inference profile whose source-region list includes the configured aws_region, and successfully invokes the model.

Actual Behavior

The add-in selects us.anthropic.claude-opus-4-7 (or similar us.-prefixed profile) and sends it to the eu-west-1 endpoint, resulting in a 400/404.

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.113

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_