This comprehensive guide compares the leading B2B authentication providers in 2026, including Auth0, Okta, SSOJet, MojoAuth, FusionAuth, and Keycloak. The article explores enterprise SSO, SCIM provisioning, pricing models, developer experience, and authentication protocols such as SAML, OAuth, and OpenID Connect. It also includes feature comparisons, real-world SaaS use cases, pricing analysis, and future identity trends like passkeys and zero-trust security. The post B2B Authentication Provider