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"Unable to validate assertion" errors

Examples of errors:

  • Unable to validate assertion: email must be a well-formed email address.
  • Unable to validate assertion: email must not be blank.
  • Unable to validate assertion: name must not be blank.

If you see “Unable to validate assertion” when setting up SSO or logging in to your account, it means the attributes were likely mapped incorrectly on the IdP (identity provider) side. 

To resolve this, we recommend verifying that all the mapping of LDAP attributes and that the outgoing name ID format is set correctly. 

Grammarly supports the following name ID format: EmailAddress

And the following attributes/claims:

  • EmailAddress
  • FirstName
  • LastName

For more information on how to configure the Grammarly app in your identity provider, please see this article.

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