So it turns out windows 10 has deprecated HomeGroups in update 1803 to to encourage paying them to put your data on their computers…
To re-enable it:
- Open the Windows Services Management Console (services.msc).
- In the list of services, look for the Function Discovery Resource Publication service. It must be disabled.
- Change the service startup type from Manual to Automatic (Delayed Start).
- restart or right click on the service and start it
I found the instructions from here.