Entering a TAN when logging in is for your security. In general, you will always be prompted to enter a TAN when you want to log in with a device that is still unknown. In the following cases, you will be prompted (again) to enter a TAN when logging in: 1. you are using a new device Each device must be confirmed individually. For example, if you use your PC and your smartphone to log in, both devices must be activated to ensure that no TAN entry is required. 2. you are using a different browser or have adjusted the browser settings. A so-called fingerprint is used to identify your device, which is made up of various parameters (e.g. device type, browser type, screen resolution). If these parameters change due to the use of a different browser or if the browser settings have changed, devices that have already been unlocked can no longer be recognized and you will be prompted again to unlock the device when you log in. Authentication For your security, please confirm your device by TAN. By entering your TAN, this device will be unlocked for a period of 90 days. Why is this important? Every time you (or another person) try to log in to your online area from another computer, you will be prompted to enter a code. This is for the security of your account.