Hi, @Henry Xiang! - My name is Piper, and I'm a moderator for Databricks. I'm sorry to hear that you've experienced this problem. Unfortunately, this has been an issue that the team hasn't been able to fix yet. 😞 However, one member has found a workaround. Please try signing up on your mobile device. That seems to bypass the problem.
Let us know how that turns out. 🙂