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Ory Kratos
Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OIDC, Magic Link, Multi-Factor Auth, SMS, SAML, TOTP, and more. Runs everywhere, runs best on Ory Network. (by ory)
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Gotcha. We definitely don't have fine granularity around when MFA is required (open issue here: https://github.com/FusionAuth/fusionauth-issues/issues/2285 ).
Other than that I'd suggest putting a page in front of our login pages with the domain logic, and modeling each set of emails as either an application, organization or tenant, depending on the specific features you need.
Either way, hope you find the right solution for your needs!
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Hey, for authentik this is actually something we're actively working on: https://github.com/goauthentik/authentik/pull/8330, and this will be included in our next feature release in April!
(Disclaimer, I am founder and CTO of authentik)