Notebook cannot use after creating an account

I got the app via Google Play Store. I created an account and signed up on my Android phone, then I cannot use it anymore. It has been showing "Initailising Notebook, hang on a sec." on the screen for over ten minutes. I can not see my preview notes on pc, either. Tried to restart under VPN, still doesn't work.

How can I solve this problem?

I chose US data center by mistake while I am in China. This message might help.

My Android version is 10 and phone model is Huawei Mate 10 (ALP-AL00).

Please help!

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Migrate your Notebook data to the new, mobile Notebook.
Zoho Notebook is transforming. The new version will include exciting new features and a completely new user experience. The initial version will be mobile based, available for Android and iOS. A new web version will be available after the initial mobile release. With the release of the new Notebook approaching, we're migrating most of your current data to the new version. Once the new version is released, there will be an additional window to migrate your data. We will not provide access to the