Just called Samsung support in Finland, who informed me that the error is at their end and I just have to wait. The person in customer service told me that they have been given the information that there is an outage on their end, but that they haven't been told anything else. I asked if there is any location online where they would post a notice about an outage like this, and/or give status updates, but the customer service person said they unfortunately don't have anything like that, although it's a good idea to put forward.
I can't believe that in this day and age, a company like Samsung operates in this manner. It's like going back to the 1990s. Any sensible company will post information like this on their support pages and keep customers and their own customer service personnel (regardless of whether it's outsourced customer service or not) up to date with what's going on.
Not to mention the idiotic system design where nothing works unless the TV can connect to a central server. Unprofessional.