Authenticate with Firebase Using Email Link in Android
https://firebase.google.com/docs/auth/android/email-link-auth
To sign in users by email link, you must first enable the Email provider and Email link sign-in method for your Firebase project: In the Firebase console, open the Auth section. On the Sign in method tab, enable the Email/Password provider. Note that email/password sign-in must be enabled to use email link sign-in. In the same section, enable Email link (passwordless sign-in) sign-in method. Click Save.
In the Firebase console, open the Auth section.
On the Sign in method tab, enable the Email/Password provider. Note that email/password sign-in must be enabled to use email link sign-in.
In the same section, enable Email link (passwordless sign-in) sign-in method.
Click Save.
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