Outbound campaign contact list upload fails silently — no error in UI

Administration
1

In NICE CXone, uploading a contact list gives you immediate validation errors - field type mismatches, missing required columns, and duplicate phone numbers are all caught at upload time.

Genesys Cloud’s contact list upload has a frustrating gap: the CSV upload via the UI completes with a green checkmark, but the actual validation runs asynchronously. You might not discover that 40% of your contacts were rejected until you check the campaign’s ‘Diagnostics’ tab hours later.

2

From a creative IVR design standpoint, silent contact list failures can destroy your proactive callback campaigns.

I designed a ‘proactive wellness check’ IVR for a healthcare client. The campaign was supposed to call 5,000 patients, but the contact list silently dropped 2,000 records because the phone numbers were formatted with parentheses instead of the expected E.164 format. The client didn’t discover the gap until patients complained they never received their wellness call.

3

We built a React-based contact list validation tool that runs client-side before uploading.

// Pre-validation before API upload
const validateContact = (row) => {
  const errors = [];
  if (!/^\+\d{10,15}$/.test(row.phoneNumber)) {
    errors.push(`Invalid E.164: ${row.phoneNumber}`);
  }
  if (!row.firstName || row.firstName.length > 256) {
    errors.push('firstName missing or too long');
  }
  return errors;
};

This catches formatting issues before they silently fail in the GC backend.

4

If you upload the contact list via the API instead of the UI, you get much better error handling.

The POST /api/v2/outbound/contactlists/{id}/contacts endpoint returns a detailed response for each record, including validation errors. The UI upload bypasses this granular feedback. Always prefer the API for production uploads.