Hello Bubble community,
I’m at the final step of my app and have hit a wall with a backend workflow that won’t trigger. I’d be really grateful for any assistance.
Simply put:
- The webapp is an English language proficiency test.
- The test taker submits answers in the form of multiple choice, short/long answer and audio recording questions.
- At the end of the test, the test taker presses a button to submit their final answers and see their results > then the Backend API Workflow (making use of OpenAI & Whisper) is prompted to instantly show the test results (including the written and spoken sections based on specific criteria provided in a prompt),
The Goal:
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User clicks a “Submit” button on the front-end (english_test page).
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This should trigger a backend workflow called masterGrader using the Schedule API Workflow action.
The Problem:
The masterGrader workflow never starts. I’ve waited several minutes and my Server Logs are completely empty for this workflow. The user is left on a permanent loading screen.
Here’s a screenshot of my Schedule API Workflow action:
What I’ve already checked:
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In Settings > API, the Enable Workflow API and Backend Workflows box is CHECKED.
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In the masterGrader backend workflow, the “Expose as public API workflow” box is CHECKED.
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There are zero errors in my app’s issue checker related to this workflow.
It feels like the Schedule API Workflow action is failing silently without creating a log or an error. Has anyone seen this before? Is there a privacy rule or a setting I could be missing that would prevent a front-end workflow from scheduling a backend one?
Thank you for any help you can offer!


