CAPIError: 400 400 Bad Request

### Describe the bug

● Request failed (transient_bad_request). Retrying...

● Request failed (transient_bad_request). Retrying...

✗ Execution failed: CAPIError: 400 400 Bad Request

### Affected version

_No response_

### Steps to reproduce the behavior

write something at normal powershell and nothing happens but error:

╭──────────────────────────────────────────────────────────────────────────────────────────────────╮
│ ╭─╮╭─╮ │
│ ╰─╯╰─╯ GitHub Copilot v1.0.34 │
│ █ ▘▝ █ Describe a task to get started. │
│ ▔▔▔▔ │
│ Tip: /init Initialize Copilot instructions for this repository. │
│ Copilot uses AI. Check for mistakes. │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯

● 💡 No copilot instructions found. Run /init to generate a copilot-instructions.md file for this project.

● Environment loaded: 1 extension, 10 MCP servers, 57 skills, 19 agents

❯ hola

● agent-alias-router loaded

● Request failed (transient_bad_request). Retrying...

● Request failed (transient_bad_request). Retrying...

✗ Execution failed: CAPIError: 400 400 Bad Request
(Request ID: D3C6:2FE361:9351D2:A31075:69E67EDB)

### Expected behavior

normal GOOOOODWORKING chat... it's became imposible to work with... IMPOSSIBLE... I have a proffessional account and ITS NOT WORKING... is there a refound?

### Additional context

_No response_

En el informe no se identifica ningún archivo fuente ni ninguna prueba. Empieza reproduciendo el fallo en PowerShell con Copilot CLI v1.0.34 usando el prompt "hola"; después, sigue la respuesta transient_bad_request y compárala con una solicitud de chat que funcione. Se considera terminado cuando el chat normal funciona sin reintentos repetidos ni un CAPIError 400.

Escrito por el modelo de indexación a partir del texto del issue.