Power Platform Community Forum Thread Details

Hello,

I'm creating a new AI model for invoices in AI builder but can't train it once I have all documents tagged. Once I click Train button I got the following message:

Any idea of what could be happening?

Thanks in advance

Categories:

AI Builder

@JL-29071200-0

Thanks for the details! Based on your issue with training an AI Builder invoice model after tagging all documents, here’s a summary of what might be going wrong and how to resolve it:

⚠️ Common Reasons Why Training Fails After Tagging

Incorrect or inconsistent tagging:
- If a field is tagged in some documents but marked as "Not in document" in others, it can confuse the model.
- Double-tagging or overlapping tags can also cause training to fail
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Collections not properly processed:
- If you're using multiple collections (e.g., per vendor), the model might average detection across all collections, which can lead to missing fields during training
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Missing or unreadable documents:
- PDFs must be readable and not image-only unless OCR is enabled.
- Ensure all documents are fully loaded and tagged before training.
Model limitations:
- AI Builder has limits on document size, number of fields, and training time. If exceeded, training may silently fail
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🛠️ Troubleshooting Steps

Here’s what you can try:

✅ Step 1: Review Tagging Consistency

Go through each collection and ensure all required fields are tagged consistently.
Avoid marking fields as “Not in document” unless absolutely necessary.

✅ Step 2: Retag Problematic Documents

If you suspect a specific document is causing the issue, retag it manually.
A known workaround is to re-tag all fields in the document that triggers the error
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✅ Step 3: Reduce Complexity

Try training with fewer collections or fewer documents to isolate the issue.
Start with one collection and gradually add more.

✅ Step 4: Use Microsoft’s Guidelines

Refer to the official documentation:

🧠 Pro Tip

If you’re working with many vendors and invoice formats, consider using Microsoft Syntex or custom AI models in Azure Form Recognizer, which offer more flexibility and control.

🏷️ Tag me if you have any further questions or if the issue persists.

✅ Click "Accept as Solution" if my post helped resolve your issue—it helps others facing similar problems.

❤️ Give it a Like if you found the approach useful in any way.