Signature Validation Failed using Java

[kumarakmuz]

??

[Mats]

This might be due to the element missing the URI attribute.
You can try the following and see if that fixes your problem:

// Sign using SHA-256 
$objDSig->addReference( 
    $doc,  
    XMLSecurityDSig::SHA256,  
    ['http://www.w3.org/2000/09/xmldsig#enveloped-signature'],
    ['force_uri' => true] // <----- this causes $force_uri to be true, which in turn results in the attribute URI="" being added
);