ホーム ー Google Workspace EN ー When You Cannot Log In
If you cannot log in to Google Workspace (TUMail, DCMail, Google Drive, etc.), please follow the instructions below.
CONTENTS
If you have forgotten your Google Workspace password, please use the following form to request a password reset.
Google Workspace Password Reset Request Form
Note: You must log in with your Tohoku University ID to submit a request. After authentication, follow the instructions on the form.
Please check the following:
Your Tohoku University ID password is different from your Google Workspace password. Make sure you are entering your Google Workspace password.
You are required to change your password when you first log in. The initial password provided in your Tohoku University ID Notification can no longer be used after this change.
Check for typing errors, including uppercase and lowercase letters, and full-width or half-width characters.
Make sure your browser is not automatically entering an old password.
If the problem persists, please use the password reset request form above.
This section is for users who cannot log in because of Two-Step Verification (2SV).
If you have already set up Two-Step Verification and can log in to your Google account, this section does not apply to you.
The deadlines for setting up Two-Step Verification are as follows:
Existing accounts: By October 31, 2026
New accounts issued from November 2026 onward: Within approximately 14 days of account issuance
If you have not enabled Two-Step Verification by the deadline, please use the following form to request backup codes.
Google Workspace Two-Step Verification Backup Code Request Form
Note: You must sign in with your Tohoku University ID to submit a request. After authentication, follow the instructions on the form.
If you have registered another verification method, select "Try another way" on the sign-in screen and use an alternative method.
If you have previously saved backup codes, you can also use one of them to sign in.
If you cannot use any of your registered verification methods and do not have backup codes, please use the following form to request backup codes for Two-Step Verification.
Google Workspace Two-Step Verification Backup Code Request Form
Note: You must sign in with your Tohoku University ID to submit a request. After authentication, follow the instructions on the form.
You may already be logged in with another Google account, such as your personal account.
Click the profile icon in the upper-right corner, check which account you are using, and switch to your Tohoku University Google account.
Faculty and Staff: TUMail (@tohoku.ac.jp)
Students: DCMail (@dc.tohoku.ac.jp)
Your browser's cache or cookies may also affect login.
If the problem persists, try logging in using a different browser or a private/incognito window.