Single Sign-On for Mobile App Will Be Unified to Login via External Browser | Scheduled for January 2027 and Later

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We will be standardizing the browser used for Single Sign-On (SSO) login in the mobile app to the external browser (the device's default browser).

Overview

• From January 2027 onwards, we plan to discontinue Single Sign-On using the in-app browser in the mobile app, and will only support login via external browser
• In preparation for this, from mid-November 2026 onwards, we will update the Group Settings for groups that have "Use external browser for Single Sign-On in mobile app" disabled, changing it to enabled on our end
• Even after the setting change, this item will remain on the Group Settings screen until the feature is discontinued. If you are unable to log in with the external browser, the Group administrator or Group sub-administrator can revert the setting to disabled themselves

Background

• The practice of restricting the browser used for authentication to the device's default browser—such as with Microsoft Intune—is becoming more widespread. In such environments, authentication cannot be completed using the in-app browser, making login impossible
• The method of using the device's default browser for login from the app is becoming widely adopted as the standard approach from the perspective of security and convenience

To ensure that Single Sign-On continues to be available across a variety of authentication environments, we will be standardizing login to use the external browser.

Release Date

Scheduled for January 2027 onwards

※ The setting change in preparation for this is scheduled for mid-November 2026 onwards

Target

Groups currently using Single Sign-On

※ The preparatory setting change targets groups that have "Use external browser for Single Sign-On in mobile app" disabled

Supported Apps

Mobile App

• iOS/iPadOS：https://itunes.apple.com/jp/app/id683050928
• Android：https://play.google.com/store/apps/details?id=jp.studist.teachme_biz

※ This does not affect Single Sign-On on the web browser version (PC) or mobile browser

Details

What Is Changing

Current Behavior

• In Group Settings, "Use external browser for Single Sign-On in mobile app" allows you to choose whether the login screen opens in the Teachme Biz in-app browser or the device's default browser (such as Safari or Chrome)

Behavior After Release

• When performing Single Sign-On in the mobile app, the login screen will always open in the device's default browser
• "Use external browser for Single Sign-On in mobile app" will be removed from the Group Settings screen

Related: What is "Use external browser for Single Sign-On in mobile app"?
https://help.teachme.jp/hc/en-us/articles/57203580043161

Schedule

① Preparation: Bulk change to the setting to use external browser (Scheduled for mid-November 2026 onwards)

• We will update the settings for groups that have "Use external browser for Single Sign-On in mobile app" disabled, changing them to enabled on our end
• This item will continue to be displayed on the Group Settings screen, and can be reverted to disabled

② Release: Discontinuation of Single Sign-On using the in-app browser (Scheduled for January 2027 onwards)

• All Single Sign-On from the mobile app will use the external browser
• This will be implemented after reviewing the Usage status following ①

What to Check Before the Setting Change in ①

Before the setting change, we recommend that the Group administrator or Group sub-administrator enable "Use external browser for Single Sign-On in mobile app" themselves and verify that they can log in via Single Sign-On from the mobile app.

Related: Configure single sign-on (SSO) (Web Browser)
https://teachme.jp/8/manuals/11468504

In the following environments, login via external browser may not be possible.

• The default browser app has been disabled or removed by device management settings
• Access to specific sites from the default browser is restricted by device management settings

If you are unable to log in, please check with your company's IT department regarding the settings of your authentication service (IdP) and device management. If you have any questions, please Contact our support desk.

Notes

• The dates listed are planned and subject to change. If any changes occur, this article will be updated accordingly.
• After the discontinuation in ②, Single Sign-On using the in-app browser will no longer be available. Even if the setting is reverted to disabled after ①, please ensure that you have an environment in which you can log in via external browser before ②.

FAQ

Update History

• 2026/10/13
  Article published

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If you have any questions or concerns, please feel free to contact our support desk at (support@teachme.jp).

Thank you for your continued use of Teachme Biz.