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# FAQ entries tagged #Help
How do I report an issue about the LINE Platform?
How does auto login work?
Auto login can be used in these situations. You don't need to perform any special configurations when implementing LINE Login into your web app to use Auto login.
iOS
- Auto login can be used when accessing a web app where LINE Login v2 or v2.1 is implemented using LINE's in-app browser or the Safari browser.
Android
- Auto login can be used when accessing a web app where LINE Login v2 or v2.1 is implemented using LINE's in-app browser or external browsers such as Chrome.
Auto login isn't supported for devices other than iOS and Android devices, devices where LINE isn't installed, and in browsers other than the Safari browser for iOS.
Also, we use iOS's Universal links and Android's Common intents features to perform auto login on external browsers. Check the official documentation for each OS for information on concepts such as how the dialog is displayed when using these features, the OS requirements for using these features, and how to disable these features.
For more information, see Auto login in the LINE Login documentation.
LINE Login shows the "Log in with the following account" screen. Does this mean that auto login has failed?
No. Single Sign On (SSO) login is running instead of auto login. For more information, see Single Sign On (SSO) Login.
What are the user ID, group ID, room ID, and one-on-one chat ID values?
The user ID used by the LINE Platform identifies a user and has the following characteristics:
The value is generated by the LINE Platform, not by a user. This is different from the LINE ID on LINE used to search for friends.
Different user IDs are generated based on the provider of the channel. As long as channels have the same provider, regardless of whether the channel is for LINE Login or Messaging API, the same user ID is used for the users of the channels.
The user ID value is a string that matches the regular expression,
U[0-9a-f]{32}.
The group ID and room ID used for group chats are values generated by the LINE Platform to identify groups and rooms.
The group ID is a string that matches the regular expression, C[0-9a-f]{32}, and the room ID is a string that matches the regular expression, R[0-9a-f]{32}.
In a LINE Front-end Framework (LIFF) app, the one-on-one chat ID (utou ID) is used to identify a one-on-one chat in addition to the three types of IDs mentioned above.
The one-on-one chat ID value is a string that matches the regular expression, UU[0-9a-f]{130}.