https://developer.okta.com/docs/guides/pwd-optional-sign-in-email/aspnet/main/
Sign in with email only | Okta Developer
Secure, scalable, and highly available authentication and user management for any app.
sign in with emailoktadeveloper
https://support.atlassian.com/loom/docs/sign-in-with-email-google-slack-or-apple/
Sign in with email, Google, Slack, or Apple | Loom | Atlassian Support
sign in with emailgoogle