Let me add some more information to this:
The CORE2-ROS boots up, blue light is solid and is connected to the internet. I can connect to it via RDP and SSH. But the systen time is not synchronized so it won’t connect to the cloud. It is default set to somewhere in 2016.
When I correct the system time by executing this command on my PC (I have done this many time in the past and it always worked):
ssh firstname.lastname@example.org "sudo date --set \"$(date)\""
Now the time is set up properly, but the blue light starts blinking again. I am still connected to it via RDP. It won’t connect to the cloud anymore.