diff --git a/src/main/java/org/opendevstack/component_provisioner/server/facade/ProvisionerActionsApiFacade.java b/src/main/java/org/opendevstack/component_provisioner/server/facade/ProvisionerActionsApiFacade.java
index f4f8c44..a69f667 100644
--- a/src/main/java/org/opendevstack/component_provisioner/server/facade/ProvisionerActionsApiFacade.java
+++ b/src/main/java/org/opendevstack/component_provisioner/server/facade/ProvisionerActionsApiFacade.java
@@ -18,6 +18,8 @@
 import org.springframework.stereotype.Service;
 
 import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
 
 @Service
 @Slf4j
@@ -97,6 +99,7 @@ private String getParameterString(ProvisionAction provisionAction, String parame
         return provisionAction.getParameters().stream()
                 .filter(parameter -> parameterName.equals(parameter.getName()))
                 .map(ProvisionActionParameter::getValue)
+                .filter(Objects::nonNull)
                 .map(Object::toString)
                 .findAny()
                 .orElse(Strings.EMPTY);
@@ -156,8 +159,25 @@ private AwxWorkflowJobLaunch buildAwxWorkflowJobLaunch(ProvisionAction provision
                 .value(provisionAction.getId())
                 .build();
 
-        provisionAction.addParametersItem(parameterItem);
+        var updatedProvisionAction = addParametersItem(provisionAction, parameterItem);
 
-        return entitiesMapper.asAwxWorkflowJobLaunch(provisionAction);
+        return entitiesMapper.asAwxWorkflowJobLaunch(updatedProvisionAction);
+    }
+
+    // In order to be safe, we create a new ProvisionAction instance with the additional parameter instead of modifying the existing one (which might be immutable or shared).
+    private ProvisionAction addParametersItem(ProvisionAction provisionAction, ProvisionActionParameter parameterItem) {
+        return Optional.ofNullable(parameterItem)
+                .map(item -> {
+                    var newParameters = provisionAction.getParameters() == null
+                            ? List.of(item)
+                            : java.util.stream.Stream.concat(provisionAction.getParameters().stream(), java.util.stream.Stream.of(item))
+                            .toList();
+
+                    return provisionAction.toBuilder()
+                            .id(provisionAction.getId())
+                            .parameters(newParameters)
+                            .build();
+                })
+        .orElse(provisionAction);
     }
 }
diff --git a/src/test/java/org/opendevstack/component_provisioner/server/facade/ProvisionerActionsApiFacadeTest.java b/src/test/java/org/opendevstack/component_provisioner/server/facade/ProvisionerActionsApiFacadeTest.java
index 78e317c..d0d41c1 100644
--- a/src/test/java/org/opendevstack/component_provisioner/server/facade/ProvisionerActionsApiFacadeTest.java
+++ b/src/test/java/org/opendevstack/component_provisioner/server/facade/ProvisionerActionsApiFacadeTest.java
@@ -10,6 +10,7 @@
 import org.opendevstack.component_catalog.client.projects_info_service.v1_0_0.model.ProjectInfo;
 import org.opendevstack.component_provisioner.server.controllers.exceptions.ProjectConfigurationException;
 import org.opendevstack.component_provisioner.server.mappers.EntitiesMapper;
+import org.opendevstack.component_provisioner.server.model.ProvisionAction;
 import org.opendevstack.component_provisioner.server.model.ProvisionActionMother;
 import org.opendevstack.component_provisioner.server.model.ProvisionActionParameter;
 import org.opendevstack.component_provisioner.server.model.ProvisionActionParameterMother;
@@ -62,7 +63,8 @@ void requestProvisionToAwx_mapsResponseCorrectly() {
         var job = new AwxWorkflowJob();
         var response = new ProvisionActionResponse();
 
-        when(entitiesMapper.asAwxWorkflowJobLaunch(action)).thenReturn(launch);
+        ArgumentCaptor<ProvisionAction> actionCaptor = ArgumentCaptor.forClass(ProvisionAction.class);
+        when(entitiesMapper.asAwxWorkflowJobLaunch(actionCaptor.capture())).thenReturn(launch);
         when(awxService.triggerWorkflowJob(action.getId(), launch))
                 .thenReturn(Pair.of(HttpStatus.OK, Optional.of(job)));
         when(entitiesMapper.asProvisionActionResponse(job)).thenReturn(response);
@@ -73,6 +75,10 @@ void requestProvisionToAwx_mapsResponseCorrectly() {
         // then
         assertEquals(HttpStatus.OK, result.httpStatusCode());
         assertEquals(response, result.awxResponseBody());
+
+        var capturedAction = actionCaptor.getValue();
+        assertThat(capturedAction.getParameters())
+                .anyMatch(p -> "action_id".equals(p.getName()) && action.getId().equals(p.getValue()));
     }
 
     @Test
@@ -192,4 +198,31 @@ void addSystemParametersToAction_usesFirstCluster_whenMultipleClustersAreReturne
         assertThat(clusterLocation).isEqualTo("cluster-primary");
     }
 
+    @Test
+    void requestProvisionToAwx_addsActionIdParameter_whenParametersIsNull() {
+        // given
+        var action = ProvisionActionMother.of(null);
+
+        var launch = new AwxWorkflowJobLaunch();
+        var job = new AwxWorkflowJob();
+        var response = new ProvisionActionResponse();
+
+        ArgumentCaptor<ProvisionAction> actionCaptor = ArgumentCaptor.forClass(ProvisionAction.class);
+        when(entitiesMapper.asAwxWorkflowJobLaunch(actionCaptor.capture())).thenReturn(launch);
+        when(awxService.triggerWorkflowJob(action.getId(), launch))
+                .thenReturn(Pair.of(HttpStatus.OK, Optional.of(job)));
+        when(entitiesMapper.asProvisionActionResponse(job)).thenReturn(response);
+
+        // when
+        var result = facade.requestProvisionToAwx(action);
+
+        // then
+        assertEquals(HttpStatus.OK, result.httpStatusCode());
+        assertEquals(response, result.awxResponseBody());
+
+        var capturedAction = actionCaptor.getValue();
+        assertThat(capturedAction.getParameters())
+                .hasSize(1)
+                .anyMatch(p -> "action_id".equals(p.getName()) && action.getId().equals(p.getValue()));
+    }
 }