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There could be various reasons why the Response Code cannot be extracted even when the correct regular expression is used in the regular expression extractor. Some possible reasons are:

1. The regular expression might not be targeting the Response Code specifically. Instead, it might be capturing other parts of the response. In this case, the regular expression needs to be modified to target the correct data.

2. The regular expression might not be structured correctly. Regular expressions have specific syntaxes and structures that need to be followed to ensure that they work as intended. If the regular expression is not structured correctly, it might not capture the intended data.

3. The Response Code might not be present in the response. If the server does not return a Response Code in the response, it cannot be extracted.

4. The regular expression extractor might not be configured correctly. For example, it might be looking for the Response Code in the wrong part of the response or using incorrect regular expression syntax.

5. The regular expression extractor might be conflicting with other post-processors or samplers in the test plan. If there is a conflict, the regular expression extractor might not work as intended.