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tomanderson83
Copper Contributor
Joined Nov 14, 2019
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Re: SSO issue with Slack on Azure AD joined machine
I have seen the same issue a few times, and again just recently when enabling a pilot of passwordless authentication. What has resolved it for me was to edit my Slack SSO configuration, change the 'AuthnContextClassRef' and set it to 'Don't send this value'. Slack is sending a payload to Azure AD that isn't supported is my suspicion.
