How do I resolve Peppol delivery issues?

Sometimes a Peppol delivery doesn’t go as expected. Here you’ll find the most common problems and how to resolve them.

Step 1: Check the error message

1. Go to Invoices
2. Click on the red status next to the problem invoice
3. Read the error message to understand what went wrong

Most common issues

Invoice is rejected

Possible causes:

• Incorrect VAT number for the customer
• Wrong Peppol Endpoint ID
• Missing required fields

Solution:

1. Check all customer details
2. Verify the VAT number
3. Ask the customer for the correct Endpoint ID

Invoice stays “processing”

Possible causes:

• Customer’s system is offline
• Network delays
• Temporary server issues

Solution:

1. Wait 30 minutes and check again
2. Contact the customer about their system
3. Send the invoice by email if it’s urgent

Endpoint not found

Possible causes:

• Customer has disabled Peppol
• Error in the Endpoint ID
• Customer has switched to another provider

Solution:

1. Verify the Endpoint ID in the Peppol Directory
2. Ask the customer for their current details
3. Update the customer details

Temporary workaround

If you cannot resolve the issue immediately:

1. Send the invoice by email with a PDF attachment
2. Inform the customer about the technical issue
3. Resolve the problem in the meantime

⚠️ Please note: for Belgian B2B customers, the structured e-invoice via Peppol remains legally required (since 1 January 2026). Use the PDF by email only as a temporary workaround and still send the invoice via Peppol once the issue is resolved.

Tip: Contact our support team if you can’t figure it out. Include the invoice number and the exact error message.