Invalid verification ISO 3166-1 alpha-2 country code for Serbia

Bug Reports
1

:bug: Describe the Bug

When pass the country as “RS”, the api returns 400 error code.

{
  "error": {
    "message": "Validation error: country must be provided as a valid 2-digit ISO country code, got RS",
    "type": "invalid_country_code",
    "code": 400
  }
}

But RS is indeed a valid ISO 3166-1 alpha-2 country code for Serbia.
Request to reproduce:

curl --request POST \
  --url https://api.perplexity.ai/chat/completions \
  --header 'Authorization: Bearer xxxx' \
  --header 'Content-Type: application/json' \
  --data '{
  "model": "sonar",
  "messages": [
    {
      "content": "masking puff gde kupiti",
      "role": "user"
    }
  ],
  "max_tokens": 123,
  "temperature": 0.2,
  "top_p": 0.9,
  "search_domain_filter": [
    "<any>"
  ],
  "return_images": false,
  "return_related_questions": false,
  "search_recency_filter": "<string>",
  "top_k": 0,
  "stream": false,
  "presence_penalty": 0,
  "frequency_penalty": 1,
  "response_format": {},
  "web_search_options": {
    "search_context_size": "low",
    "user_location": {
      "country": "RS"
    }
  }
}'

## ✅ Expected Behavior
successful code 200.

## ❌ Actual Behavior
400 bad request

## 🔄 Steps to Reproduce
1. Call the API with the following request:
2. Observe the unexpected behavior.

## 📌 API Request & Response (if applicable)

## 🌍 Environment
- **API Version:** [e.g., sonar-3.1]
- **SDK (if applicable):** [e.g., Python SDK v0.5]
- **Operating System:** [e.g., MacOS, Linux, Windows]

## 📎 Logs or Screenshots (if applicable)
Add any logs or screenshots that can help debug the issue.

## 📝 Additional Context
Add any other context about the problem here.
2

also PR stands for Puerto Rico, it returns 400 error as well.
or anyone knows which standard is used in perplexity?