Forge UI Modifications App Not Working in Jira

Forge Forge UI Kit and Custom UI
1

Hi everyone,

I’m trying to build a forge app using the jira:uiModifications module to automatically set the Description field value on the Global Issue Create screen. But the UI modification doesn’t seem to apply at all — nothing is showing up, and there are no errors in the browser console or forge tunnel terminal.

What I’ve done:

  1. My manifest.yml has the following:

modules:
jira:uiModifications:
- key: ui-modifications-example
title: “Set Description Field”
resource: uiModificationsMain
extensionContext: global-issue-create
trigger:
- key: register-uimod-trigger
function: main
events:
- avi:forge:installed:app
function:
- key: main
handler: index.run
resources:

  • key: uiModificationsMain
    path: static/uimod/build
    permissions:
    scopes:
    • manage:jira-configuration
    • read:jira-user
    • read:jira-work
    • write:jira-work
    • read:project:jira
    • read:issue-type:jira

2. My backend `index.js` registers the UI Modification via `POST /rest/api/3/uiModifications` using hardcoded project and issue type IDs.

3. In the frontend `App.jsx`, I have:

import { uiModificationsApi } from '@forge/jira-bridge';

console.log('[UI Mod] Loaded');

uiModificationsApi.onInit(({ api }) => {
  console.log('[UI Mod] onInit fired');
  const desc = api.getFieldById('description');
  if (desc) {
    desc.setValue('Hello from UI Mod!');
    console.log('[UI Mod] Description set');
  } else {
    console.warn('[UI Mod] Description field not found');
  }
  return ['description'];
});
  1. I’ve built the frontend (npm run build), deployed (forge deploy), and installed the app (forge install). I’m running forge tunnel.

Problem:

  • The app deploys with no error.
  • Nothing shows up or changes when opening the Create Issue screen.
  • No logs appear in the browser or terminal (forge tunnel).
  • window._jira is undefined in the browser console.

What I’ve tried:

  • Confirmed my project is company-managed.
  • Verified issue type and project IDs.
  • Rebuilt, reinstalled, redeployed multiple times.
  • Added debug logs — none are printed.
  • Tried both global-issue-create and issue-create in extensionContext.

Ask:

What could be preventing the jira:uiModifications app from loading or executing on the Global Issue Create screen?
Is there anything else I should check or configure?

Any guidance is appreciated :folded_hands: