[New Experiment-VS Code]: After saving the workflow, an error appears for the Send an email action and send a message action.

[v-ksruthi]

Severity

P1 - Critical (Blocking production)

Describe the Bug with repro steps

Repro Steps:

1. Install VSIX version 5.273.0.
2. Create a Logic App workspace and begin a new project.
3. Set the Bundle version and URL in both host.json and localsettings.json.
4. Open the designer.
5. The new Logic Apps experience is available as a preview; choose the Enable Preview option.
6. In the new designer, add an HTTP request trigger and several actions, such as calling an Azure Function, sending a message via Service Bus, and sending an email.
7. Save the workflow.

Expected result: Once the workflow is saved, there should be no errors visible in the workflow.
Actual result: After saving, an error occurs in the send an email action.

What type of Logic App Is this happening in?

Standard (VSCode)

Are you experiencing a regression?

No response

Which operating system are you using?

Windows

Did you refer to the TSG before filing this issue? https://aka.ms/lauxtsg

Yes

Workflow JSON

Screenshots or Videos

parameterizationnewdesignervscode.zip

Environment

VS Code
VSIX Version: 5.273.0
Bundle Version : 1.161.3

Additional context

No response

[takyyon]

AI Triage Analysis

Component: designer-v2 / Serialization | Priority: P1 | SKU: Standard (VS Code)

Relevant Code

• libs/designer-v2/src/lib/core/actions/bjsworkflow/serializer.ts — Workflow serialization for the new designer, handles parameterization on save
• apps/vs-code-react/src/app/designer/servicesHelper.ts — VS Code designer services including save workflow handler
• libs/logic-apps-shared/src/designer-client-services/lib/standard/run.ts — Standard run service for API connector operations

Probable Root Cause

The error appearing on Send Email (Office 365) and Send Message (Service Bus) actions after saving suggests a serialization issue with API Connection (managed connector) actions in the new designer-v2. These connector actions require specific connection reference parameterization when serialized. The attachment filename "parameterizationnewdesignervscode" confirms this is a parameterization problem. When the new designer serializes the workflow, it may not correctly handle the connection reference format that managed connectors (like Office 365 and Service Bus) expect. The v2 serializer may be missing or incorrectly transforming host.connection.referenceName or the authentication parameter in the action definitions, causing the runtime to report errors when it tries to validate the saved workflow against the connection configuration.

Suggested Investigation

1. Compare the serialized workflow JSON (workflow.json) after saving in new vs old designer — focus on the connection reference structure for Send Email and Send Message actions
2. Check if connections.json is being updated correctly with the managed API connection references when saving from the new designer
3. Look at the error details in the VS Code output panel (Logic Apps extension channel) for the specific validation error message
4. Verify that the parameterize connections setting in the new designer produces valid connection references for managed connectors

Similar Issues

• No directly matching prior issues found for this specific v2 serialization scenario

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