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@Julian Jakob has a blog about Azure Certificate Based Authentication with Citrix FAS: https://www.julianjakob.com/citrix-fas-azure-ad-cba-with-primary-refresh-token-prt/

super, thanks

We are getting SSO PRT without cert based now. no clue how but its been working for about 2-3 months. We are hybrid though but prior to that time frame could not get the PRT to come through.