Crossref XML export fails with an ORCID Sandbox identifier in OMP 3.5

[FlpTiffany]

Hi,

while testing the plugin with OMP 3.5 and the ORCID Public API Sandbox, I found an issue with Crossref XML export.

Environment

• OMP 3.5.0-5
• OJSBR Crossref plugin for OMP 3.5
• ORCID integration configured with the Public Sandbox API
• Crossref XML schema 5.3.1

Steps to reproduce

1. Configure ORCID in OMP using the ORCID Public Sandbox API.
2. Authenticate an ORCID Sandbox account for a user.
3. Submit and publish a monograph with this user as a contributor.
4. Try to export the monograph from:
   Settings → Distribution → DOIs → Export DOIs

Result

The export fails with:

An XML validation error occurred and the XML could not be exported.

As a control test, I removed the ORCID identifier from the contributor and exported exactly the same publication again. The XML export then succeeded.

It appears that OMP stores the authenticated sandbox identifier as:
https://sandbox.orcid.org/0000-....
and the Crossref plugin exports the value directly into the element.

However, the Crossref 5.3.1 schema accepts ORCID values matching:
https://orcid.org/0000-....
and therefore the sandbox URI fails schema validation.

This appears to affect testing rather than production ORCID identifiers, but it makes it difficult to test the full "ORCID Sandbox → OMP → Crossref XML" workflow.

Would it be possible either to handle Sandbox ORCID identifiers during Crossref export, or document this limitation for users testing the plugin?

I would be happy to provide additional test information if useful.