I want to say that the certificates is really difficult thing. it’s
Especially if you have two SDC 2.3. and  for wearable.
  Everyone can feel it on their skin.
  I recently removed the old certificates due to mess and removed SDC for wearable.
 I began to do all in 2.3.  for device wearable. There‘s a hand made certificate as in the Help of SDC 2.3.
  Application for wearable was rejected registration with reason.

AUTHOR SIGNATURE ERROR. UNKNOWN ERROR
Title : SDK Default key was used
Detailed : SDK default key was used. To publish developer own key should be used with Registration file
For more information, refer to IDE > Help Contents > Generating a certificate request
Or, Help Contents > Getting Started with Tizen wearable > Development Environment > Tizen SDK for wearable > Certificates

  What’s wrong here? I  made by myself certificate for all devices. So it is impossible? Then it have  to be writen in  Help  2.3 sdc , I think…