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It may probably caused by:
- Metadata Exchange Validation Confirm that the IdP-generated metadata file (from OneLogin) is accurately uploaded to the SP.
Validate that the SP metadata is correctly registered in OneLogin.
- Certificate Compliance Ensure the X.509 certificate used for SAML response signing matches the SP’s configured certificate.
Verify the certificate’s validity period to prevent expiration-related failures.
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Assertion Consumer Service (ACS) URL Alignment Cross-check that the ACS URL provided by the SP precisely matches the endpoint configured in OneLogin.
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SAML Response Structure Verification Confirm the SAML response conforms to the SP’s expected format, attributes, and bindings (e.g., HTTP-POST or HTTP-Redirect).
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Time Synchronization Audit the system clocks on both IdP and SP servers to prevent SAML validation errors due to excessive clock skew.
https://stackoverflow.com/questions/55028872/onelogin-php-saml-issues-with-saml-response
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