async def METHOD_NAME(nir: str, birth_date: str) -> DossierIndividuData | None:
    pe_client = PoleEmploiApiClient(
        auth_base_url=settings.PE_AUTH_BASE_URL,
        base_url=settings.PE_BASE_URL,
        client_id=settings.PE_CLIENT_ID,
        client_secret=settings.PE_CLIENT_SECRET,
        scope=" ".join(
            [
                "api_rechercher-usagerv1",
                "api_diagnosticargumentev1",
            ]
        ),  # noqa: E501
    )
    beneficiary = await pe_client.search_beneficiary(nir=nir, date_of_birth=birth_date)
    if beneficiary and beneficiary.identifiant:
        return await pe_client.get_dossier_individu(beneficiary.identifiant)