Digital Signature

Select Manager > Digital Signature > Administration.
The Digital Signature Administration mask is opened.

Select the entry DEMOEP.

Click on the highlighted entry with the right mouse button and choose Unlock Key from the context menu.
The key status will be changed to Not verified by the system.

You can also assign a new key to a user. This is useful for example when the original key is invalid (and is therefore automatically disabled).
As an alternative you can also enable a disabled key in a key directory.