I've had exactly the same problem .
Bought my ticwatch 2 from kickstarter and was so excited, but it's not lasted the test of time.
The back of the watch has cracked and expanded.
I've contacted Mobvoi to hopefully get a response.
How can i get this fixed or is it just destined for the bin now....

Weirdly, once i'd turned my bluetooth on it allowed me to register via email.

Facebook registration still didn't work though.

I'm having this same problem. Comes up with network error.

Won't let me login with Facebook, or create a new account.