The phrase “invalid UIDAI response format” usually means the receiving system got a UIDAI/Aadhaar response that did not match the expected XML structure or version. UIDAI’s own error docs show closely related technical errors like 510: Invalid Auth XML format and 511: Invalid PID XML format , which point to malformed or non-compliant request/response data.

What it means

In practice, this error often appears in PF/EPFO or Aadhaar-linked workflows when the integration cannot parse the response from UIDAI correctly, or when the request sent to UIDAI does not follow the required authentication format. Public posts and videos discussing this error tie it to PF claim submission failures such as “claim not submitted on portal” and “please retry,” but those are community reports rather than official UIDAI guidance.

Likely causes

  • The application is using an outdated UIDAI API version.
  • The XML structure is invalid or incomplete.
  • PID/Auth formatting does not comply with UIDAI specs.
  • The integrating portal is misreading UIDAI’s response or has a temporary technical issue.

What to do

  1. Retry after some time if the error is on a portal side.
  1. Ensure the Aadhaar-linked details are correct and the latest API/spec is being used.
  1. If you are a user of PF/EPFO services, contact the portal’s support or helpdesk, since the problem is often on the integration side rather than your Aadhaar itself.

UIDAI-related error codes

Code| Meaning
---|---
510| Invalid Auth XML format. 9
511| Invalid PID XML format. 9
512| Invalid Aadhaar holder consent in “rc” attribute of “Auth”. 9

If you want, I can also explain this in simple PF/EPFO terms or help you figure out whether the error is from UIDAI, EPFO, or your Aadhaar data.