Apple failed to synchronize on its mobile terminal, so it exited the login. As a result, it could not log in again

The computer side updates the software as required , And set up , Synchronous success .

Apple Mobile , Upgrade according to the software 、 Reset the data warehouse , Import key . When setting the synchronization directory, start to rotate around , Later, it shows that there is no directory , I created a new synchronization directory on the computer , Delete the old catalogue . As a result, the newly created directory cannot be seen on the mobile phone .

I want to log out and try again , Results after exiting , I can't log in anymore , And there was no response . Don't say my user name and password are wrong , I tried it on the computer several times, but it was ok . Nor is it the problem of the mobile network , Everything else works well with mobile phones .

What's the status of this ？ It's going crazy ！