I am not able to upload HLK signed package into dashboard and getting following error. I am using HLK version 10.0.10586.0
It looks like your package was created with an unsupported version of the kit. Ensure you're using a supported version of the kit and regenerate your package and try again. If you continue to experience the issue contact Sysdev@microsoft.com.
Best Regards
Mrutyunjaya