| Error code | Reason | Solution |
| Error code 4 and OCES002 | Your NemID is set up for login to your bank only and not for digital signatures. | Most often this can be solved by the sender of the document(s) adding your CPR/SSN to the validation in the document(s) - if this does not work, you can follow this guide. |
| Error code 5 |
Your name is not active in your NemID. This makes us unable to validate your name. A common cause is name and/or address protection. |
Sometimes this can be fixed by simply activating the name in the NemID. The sender can activate the signers CPR number in a case file. |
| Error code 400 | Your digital signature is either expired or invalid. | Most of the time the issue can be solved by updating your NemID certificate. View more. |
| SRV001 | The signature on the client parameters could not be verified. | A technical error has occurred. Please try again or contact the sender of the signing request and ask them to add your SSN to the case file, this might solve the problem. |