The website currently have no access to the Nebula API.
There is no answer or any type of contact by Starbreeze yet.

I wrote to them, but still waiting for a response. Meanwhile I'm working on a temporary solution to enable challenges sync again, but it will take one or two days.

I will edit this article when there are updates on the topic.
Also I will make a Discord Server in a few days, for easier communication about website updates, bugs, API status etc.

Edit: Access to the Nebula API is restored.