| Error code | Reason | Solution |
| Error code 4 | Your NemID is setup for login to your bank og not digital signatures. | Your NemID need to be updated so it can be used for digital signature. See here how |
| Error code 5 | Your name is not active in your NemID so we can not validate your name. A common reason can be hidden name and address, | Sometimes this can be fixed by simply activating the name in the NemID. Or the sender can activate the signers CPR number in the case file. |
| Error code 400 | You digital signature i either expired or invalid. | Most of the time the issue can be solved by updating your NemID certificate. See here how you do. |
