To be able to log in with Face ID, please enable this feature in the app settings.
In order to do that, please check your device's settings.
If you had Face ID activated and then disabled it, next time you decide to activate it, you need to create a new Face ID by resetting the setting.
When you log out from the app, you will be suggested to create a Face ID to log in more easily next time. So the next time you open the app (after creating a Face ID), you will be able to log in with the Face ID option.
If, for any reason, you do not want to log in with Face ID, press “Other options” to log in as usual.
The Taimi account still needs to be registered with an Apple ID/phone number/email/Snapchat/Facebook.