Merging XFDF using the Express REST API Returns ERROR: code: 26 message: "Origin does not match the domain set on license key"

Which product are you using?
PDF.js Express Plus

PDF.js Express Version
|UI version|‘8.1.0’|
|Core version|‘8.1.1’|
|WebViewer Server|false|
|Full API|false|

Detailed description of issue
We recently bought your product.
After adding the keys however we started experiencing an issue where calls to the “” endpoint would return: Code: 26 Messager: “Origin does not match the domain set on license key”

We are calling the endpoint from a a subdomain of the domain set in the account settings of the account we bought the licence with.

Expected behaviour
A successful API call returning the { url, key, id }

Does your issue happen with every document, or just one?
Every document. Every call to the API.

Code snippet

const xfdf = await annotationManager.exportAnnotations({ links: false, widgets: false, useDisplayAuthor: true });
const fileData = await docViewer.getDocument().getFileData({});
const blob = new Blob([fileData], { type: ‘application/pdf’ });
const data = new FormData();
data.append(‘xfdf’, xfdf);
data.append(‘file’, blob);
data.append(‘license’, ‘ourclientlicencekey’);
const response = await fetch(‘’, {
method: ‘post’,
body: data
}).then(resp => resp.json());
const { url, key, id } = response;

Hi a.krueger,

Are you using a proxy by chance?
Can you provide the URL you’re hosting on and the subdomain that is calling the API? (you can DM me if you don’t feel comfortable sending that here)

Best regards,