Single Logout between Salesforce and Auth0

Hello,

Has anyone had luck with implementing SLO between Auth0 IdP and Salesforce SP? I have issues with Salesforce SLO endpoint rejecting Logout Requests sent by Auth0 with the generic error:

Logout Error
We are unable to log you out. Please contact your administrator for more information.

Logout Request has valid SessionIndex and NameID which match one from a Login Response:

<samlp:LogoutRequest xmlns:samlp=“urn:oasis:names:tc:SAML:2.0:protocol”

                 ID="_d1835e3e40db6ae345f3"
                 Version="2.0"
                 IssueInstant="2019-09-17T22:27:52Z"
                 Destination="https://test.cs51.my.salesforce.com/services/auth/sp/saml2/logout"
                 Consent="urn:oasis:names:tc:SAML:2.0:consent:unspecified"
                 >
<Issuer xmlns="urn:oasis:names:tc:SAML:2.0:assertion">urn:sso.test.com</Issuer>
<NameID xmlns="urn:oasis:names:tc:SAML:2.0:assertion"
        Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
        >test@test.com</NameID>
<samlp:SessionIndex>_FhGZ1-k66dhoeWAb4wKpGUDqyStFGY4V</samlp:SessionIndex>

</samlp:LogoutRequest>