If V2,
1. Search for Port Number in the MCAEmsigner app.
2 . Search "https//
127.0.0.1:
1585" the last four digits must be replaced by the four digit port Number, in the browser you are trying to register your DSC.
3. Continue and procced to the link even if the browser warns you.
4. Retry to attach the DSC.
If V3,
1. Make sure your Embridge app's status is "running". If not, then refresh or restart the app.
2. After which, wait for sometime in the DSC Association Section as it can take some minutes.
3. Make sure to change DSC Password.