1. Obtain a SAML assertion from your identity provider. The assertioncan be either in plain XML format or base64 encoded. If a usertries to log in to Salesforce and fails, the invalid SAML assertion is used to automaticallypopulate the SAML Assertion Validator if possible.
2. From Setup, enter Single Sign-On Settings in the Quick Find box, then select Single Sign-On Settings, thenclick SAML Assertion Validator.
3. Enter the SAML assertion into the text box, and click Validate.
4. Share the results of the validation errors with your identity provider.