diff --git a/.github/workflows/deploy_tre.yml b/.github/workflows/deploy_tre.yml
index bddea6979f..a630c99905 100644
--- a/.github/workflows/deploy_tre.yml
+++ b/.github/workflows/deploy_tre.yml
@@ -36,7 +36,7 @@ jobs:
         ${{ (github.event_name == 'push' && 'extended or extended_aad')
         || 'extended or extended_aad or shared_services or airlock' }}
       environmentName: ${{ github.event.inputs.environment || 'CICD' }}
-      E2E_TESTS_NUMBER_PROCESSES: 1
+      E2E_TESTS_NUMBER_PROCESSES: 3
       DEVCONTAINER_TAG: 'latest'
     secrets:
       AAD_TENANT_ID: ${{ secrets.AAD_TENANT_ID }}
diff --git a/.github/workflows/pr_comment_bot.yml b/.github/workflows/pr_comment_bot.yml
index cfc14dc739..6e0d034ae6 100644
--- a/.github/workflows/pr_comment_bot.yml
+++ b/.github/workflows/pr_comment_bot.yml
@@ -164,7 +164,7 @@ jobs:
         (needs.pr_comment.outputs.command == 'run-tests-shared-services' && 'shared_services') ||
         (needs.pr_comment.outputs.command == 'run-tests' && '') }}
       environmentName: CICD
-      E2E_TESTS_NUMBER_PROCESSES: 1
+      E2E_TESTS_NUMBER_PROCESSES: 3
       DEVCONTAINER_TAG: ${{ needs.pr_comment.outputs.prRefId }}
     secrets:
       AAD_TENANT_ID: ${{ secrets.AAD_TENANT_ID }}
diff --git a/Makefile b/Makefile
index 4c0b32bafa..b890ff0fbb 100644
--- a/Makefile
+++ b/Makefile
@@ -345,8 +345,12 @@ test-e2e-extended-aad: ## 🧪 Run E2E extended AAD tests
 	$(call target_title, "Running E2E extended AAD tests") && \
 	$(MAKE) test-e2e-custom SELECTOR=extended_aad
 
-test-e2e-shared-services: ## 🧪 Run E2E shared service tests
-	$(call target_title, "Running E2E shared service tests") && \
+test-e2e-workspace-services: ## 🧪 Run E2E workspace services tests
+	$(call target_title, "Running E2E workspace services tests") && \
+	$(MAKE) test-e2e-custom SELECTOR=workspace_services
+
+test-e2e-shared-services: ## 🧪 Run E2E shared services tests
+	$(call target_title, "Running E2E shared services tests") && \
 	$(MAKE) test-e2e-custom SELECTOR=shared_services
 
 test-e2e-custom: ## 🧪 Run E2E tests with custom selector (SELECTOR=)
diff --git a/api_app/_version.py b/api_app/_version.py
index 1a95d56216..8261536c68 100644
--- a/api_app/_version.py
+++ b/api_app/_version.py
@@ -1 +1 @@
-__version__ = "0.19.3"
+__version__ = "0.19.4"
diff --git a/api_app/api/routes/workspaces.py b/api_app/api/routes/workspaces.py
index e1d049c3f0..a3513eabe8 100644
--- a/api_app/api/routes/workspaces.py
+++ b/api_app/api/routes/workspaces.py
@@ -1,4 +1,5 @@
 import asyncio
+import time
 
 from fastapi import APIRouter, Depends, HTTPException, Header, status, Request, Response
 
@@ -267,12 +268,25 @@ async def create_workspace_service(response: Response, workspace_service_input:
         workspace_patch = ResourcePatch()
         workspace_patch.properties = {"address_spaces": workspace.properties["address_spaces"] + [workspace_service.properties["address_space"]]}
         # IP address allocation is managed by the API. Ideally this request would happen as a result of the workspace
-        # service deployment via the reosurce processor. there is no such functionality so the database is being
+        # service deployment via the resource processor. there is no such functionality so the database is being
         # updated directly, and an "update" on the workspace is called by the workspace service pipeline.
-        try:
-            await workspace_repo.patch_workspace(workspace, workspace_patch, workspace.etag, resource_template_repo, resource_history_repo, user, False)
-        except CosmosAccessConditionFailedError:
-            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail=strings.ETAG_CONFLICT)
+        MAX_RETRIES = 3
+        RETRY_DELAY = 1
+
+        retries = 0
+        while retries < MAX_RETRIES:
+            try:
+                await workspace_repo.patch_workspace(workspace, workspace_patch, workspace.etag, resource_template_repo, resource_history_repo, user, False)
+                break
+            except CosmosAccessConditionFailedError:
+                workspace = await workspace_repo.get_workspace(workspace.id)
+                workspace.etag = workspace.etag.strip('"')
+                workspace_patch = ResourcePatch()
+                workspace_patch.properties = {"address_spaces": workspace.properties["address_spaces"] + [workspace_service.properties["address_space"]]}
+                retries += 1
+                if retries == MAX_RETRIES:
+                    raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail=strings.ETAG_CONFLICT)
+                time.sleep(RETRY_DELAY)
 
     operation = await save_and_deploy_resource(
         resource=workspace_service,
diff --git a/e2e_tests/resources/strings.py b/e2e_tests/resources/strings.py
index 8e690aa6a5..724c69f3fd 100644
--- a/e2e_tests/resources/strings.py
+++ b/e2e_tests/resources/strings.py
@@ -14,10 +14,13 @@
 AIRLOCK_IMPORT_REVIEW_WORKSPACE = "tre-workspace-airlock-import-review"
 
 AZUREML_SERVICE = "tre-service-azureml"
+DATABRICKS_SERVICE = "tre-service-databricks"
 GUACAMOLE_SERVICE = "tre-service-guacamole"
 GITEA_SERVICE = "tre-workspace-service-gitea"
-MLFLOW_SERVICE = "tre-service-mlflow"
+GUACAMOLE_SERVICE = "tre-service-guacamole"
+HEALTH_SERVICE = "tre-workspace-service-health"
 MYSQL_SERVICE = "tre-workspace-service-mysql"
+OHDSI_SERVICE = "tre-workspace-service-ohdsi"
 HEALTH_SERVICE = "tre-workspace-service-health"
 AZURESQL_SERVICE = "tre-workspace-service-azuresql"
 OPENAI_SERVICE = "tre-workspace-service-openai"
diff --git a/e2e_tests/test_workspace_services.py b/e2e_tests/test_workspace_services.py
index cd48910817..21ab0ed2b6 100644
--- a/e2e_tests/test_workspace_services.py
+++ b/e2e_tests/test_workspace_services.py
@@ -10,7 +10,7 @@
 workspace_services = [
     strings.AZUREML_SERVICE,
     strings.GITEA_SERVICE,
-    strings.MLFLOW_SERVICE,
+    # strings.OHDSI_SERVICE,
     strings.MYSQL_SERVICE,
     strings.HEALTH_SERVICE,
     strings.AZURESQL_SERVICE,
@@ -64,11 +64,12 @@ async def ping_guacamole_workspace_service(workspace_service_path, access_token,
     await check_aad_auth_redirect(endpoint, verify)
 
 
+@pytest.mark.extended
 @pytest.mark.workspace_services
 @pytest.mark.timeout(45 * 60)
 @pytest.mark.parametrize("template_name", workspace_services)
-async def test_install_workspace_service(template_name, verify, setup_test_workspace) -> None:
-    workspace_path, workspace_id = setup_test_workspace
+async def test_install_workspace_service(template_name, verify, setup_test_aad_workspace) -> None:
+    workspace_path, workspace_id = setup_test_aad_workspace
     workspace_owner_token = await get_workspace_owner_token(workspace_id, verify)
 
     service_payload = {