No one said it was rocket science and that screenshot is irrelevant and useless. Did you actually try to submit an Apple Watch for service? I was also able to get an estimate. However, once I got to the page where you submit the watch for service, it gave me an error message saying “Online repair unavailable” and the website would not let me proceed. Just like the OP stated.
I just got off the phone with Apple Repair. I gave them all my information … and THEY had the same problem. In fact, they couldn’t even schedule an appointment at a store to get the device repaired. It had to be escalated to a manager who was able to get the repair box sent to me.
I’m located in California, USA