10 Common SSO Implementation Mistakes (and How to Avoid Each)

Common Single Sign-On (SSO) implementation mistakes often arise after an enterprise customer starts using the system, revealing issues such as inadequate provisioning, ignoring IdP-initiated flows, and treating email as a mutable user identifier. Problems frequently stem from predictable implementation gaps rather than bugs in the SAML specification, leading to errors like "account not found" for new users due to missing Just-in-Time (JIT) provisioning or "SSO not working" when IdP-initiated flows are not handled. Additionally, hardcoding IdP metadata can complicate updates, while failing to account for clock skew or lacking SCIM provisioning introduces compliance and access control risks. Effective SSO management requires dynamic configuration, support for both SP and IdP-initiated flows, and integration with SCIM for comprehensive user lifecycle management. Platforms like SSOJet can mitigate these issues by automating complex processes and reducing the maintenance burden on engineering teams.