I tried to log in using the school webmail. And I entered the verification code through the app. Then I asked him to enter the verification code that came to my webmail. However, other than the webmail I first entered on the screen, I can't keep logging in and I can't use the program. What should I do?
Without any system information and details about your Internet connection nobody can tell you much. Usually this boils down to mundane conenction issues, so if you use e.g. an unstable wireless connection, switch to an alternative.