### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

A bug happened!

Model connection testing is failing from the UI with the following error:

Error testing connection: litellm.BadRequestError: LLM Provider NOT provided. Pass in the LLM provider you are trying to call....

- Debug log is empty. Simple return 200

- Claude code is working

My config ``` - model_name: claude-haiku-4.5 litellm_params: model: bedrock/converse/eu.anthropic.claude-haiku-4-5-20251001-v1:0 aws_region_name: eu-central-1 drop_params: true additional_drop_params: ["extra_headers"]

```

### Steps to Reproduce

1. 2. 3.

### Relevant log output

```shell

```

### What part of LiteLLM is this about?

_No response_

### What LiteLLM version are you on ?

v1.86.1

### Twitter / LinkedIn details

_No response_