In the case your game is stuck in this screen and doesn't go further than that, this issue might be caused by two reasons.
Beta Server
Once you become a Beta player, your inventory will be different due to game/ network version differences. Your inventory differences will cause your game to stuck in this screen since your inventory will no longer be functional in global version.
If you had been a Beta player and to learn more, check this article.
Connection Issues
You might be experiencing this issue most likely because of connection issues. When your internet is unstable, it is likely that you will get this error.
Apart from unstable internet, if your internet connection is completely lost, you will receive an error message stating “No internet connection”.
If you don't know how to fix and check the connection issues, check this article.
Data Pile-up
When your device's data is piled up, it might struggle to load scenes in game cause you to have an extremely low performance than usual. This issue could be easily solved by clearing your game data.
If you want to learn more about how to clear your data and improve your device performance, check this article
If you complete these steps and still face with the same issue, please contact us.