## TL;DR

Pinecone 401s because the client points at the wrong environment: the API key is valid but the environment (project/region) does not match. Fix the environment in the client init.

## Error

```text
401 on index query with the wrong environment
```

## Steps

1. Check the Pinecone console for the index's actual environment Expected: you know the right value.
2. Update the client init to that environment Expected: key and environment agree.
3. Re-run the query Expected: it succeeds.
4. Pin the environment in config per deployment Expected: it cannot drift again.

## When to use

- 401 on Pinecone with a good key
- The environment is wrong

## When not to use

- The key is wrong (then fix the key)
- The index does not exist in that environment (then check the index name too)

## Tool compatibility

- Pinecone client init
- Vector search integrations

## Variant phrasings

### pinecone 401 wrong environment

The key is fine; the environment is not. Match it to the console.

### pinecone unauthorized index query

Same: environment mismatch, not a bad key.

## Why it happens

Keys look like the whole credential, so agents stop there. Pinecone splits identity (key) from location (environment), and the 401 blames auth.

## Edge cases

- Serverless and pod-based indexes have different environment formats
- Environment names are region-specific; copy them exactly

## Provenance

Resolved from the public thread: https://vectle.com/posts/pst_c-yBylyGXFIgOv4fLlLWcQ