MITID_NONCE_COOKIE_MALFORMED - Danish MitID - Idura Verify Documentation
  1. Danish MitID
  2. MITID_NONCE_COOKIE_MALFORMED

MitID has a requirement that the login session must be bound to the user device. Idura Verify uses a cookie for this requirement.

The MITID_NONCE_COOKIE_MALFORMED error code indicates that the required cookie is present, but not in the shape we expect it to be - indicating a potential malicious cookie.