Curious. I'm not using Zitadel yet, but we are planning to. It seems to support all of those features. What was the missing part for you?

https://zitadel.com/docs/apis/saml/endpoints

https://zitadel.com/docs/guides/integrate/identity-providers...

https://zitadel.com/docs/concepts/features/selfservice#mfa--...

https://zitadel.com/docs/guides/migrate/introduction#multi-t...

https://zitadel.com/blog/zitadel-as-sso-provider-for-selfhos...