fix(oci): use home region for audit configuration API call (#10347)

Co-authored-by: Hugo P.Brito <hugopbrit@gmail.com>

tests/providers/oraclecloud/oraclecloud_provider_test.py

@@ -255,3 +255,61 @@ class TestOraclecloudProviderInit:
         assert provider.compartments == mock_compartments
         assert provider.home_region == "us-ashburn-1"
         mock_set_global.assert_called_once_with(provider)
+
+    def test_home_region_uses_full_subscription_list_not_region_filter(self):
+        """Home region must come from the full subscription list, not the --region filter.
+
+        When auditing a single non-home region, the tenancy home region must still be
+        resolved correctly so tenancy-level APIs (e.g. the Audit configuration) target it.
+        """
+        mock_session = OCISession(
+            config={"region": "eu-frankfurt-1"}, signer=None, profile="DEFAULT"
+        )
+        mock_identity = OCIIdentityInfo(
+            tenancy_id="ocid1.tenancy.oc1..aaaaaaaexample",
+            tenancy_name="test-tenancy",
+            user_id="ocid1.user.oc1..aaaaaaaexample",
+            region="eu-frankfurt-1",
+            profile="DEFAULT",
+            audited_regions=set(),
+            audited_compartments=[],
+        )
+        # The audited set is the non-home region; the full subscription list includes home
+        audited_regions = [
+            OCIRegion(
+                key="eu-frankfurt-1", name="eu-frankfurt-1", is_home_region=False
+            ),
+        ]
+        all_subscribed_regions = [
+            OCIRegion(
+                key="eu-frankfurt-1", name="eu-frankfurt-1", is_home_region=False
+            ),
+            OCIRegion(key="us-ashburn-1", name="us-ashburn-1", is_home_region=True),
+        ]
+        with (
+            patch(
+                "prowler.providers.oraclecloud.oraclecloud_provider.OraclecloudProvider.setup_session",
+                return_value=mock_session,
+            ),
+            patch(
+                "prowler.providers.oraclecloud.oraclecloud_provider.OraclecloudProvider.set_identity",
+                return_value=mock_identity,
+            ),
+            patch(
+                "prowler.providers.oraclecloud.oraclecloud_provider.OraclecloudProvider.get_regions_to_audit",
+                side_effect=[audited_regions, all_subscribed_regions],
+            ),
+            patch(
+                "prowler.providers.oraclecloud.oraclecloud_provider.OraclecloudProvider.get_compartments_to_audit",
+                return_value=["ocid1.compartment.oc1..aaaaaaaexample"],
+            ),
+            patch("prowler.providers.common.provider.Provider.set_global_provider"),
+        ):
+            provider = OraclecloudProvider(
+                region={"eu-frankfurt-1"},
+                config_content={"dummy": True},
+                mutelist_content={"Accounts": {}},
+            )
+
+        assert provider.regions == audited_regions
+        assert provider.home_region == "us-ashburn-1"