Hi John,
Do you mean you have deployed ADFS, and now you have some concerns about the “ADFS + smartcard” authentication for rich clients?
I have also tried hard to search for the related references and consulted senior members. After doing research, I just realized one thing, John, this scenario (use smartcard authentication for rich client) is not officially supported currently, and there is no official articles about the detailed deployment for smart card at present. Although, I'd like to help you, I'm not the master of this field and I'm lacking in the detailed knowledge of smartcard. I'm so sorry that I could not provide the detailed instructions about whether smartcard is supported for rich clients from my side. Your understanding is pretty appreciated, John.
Once there is any officially release about this specific scenario, we will let you know at the first time. John, thanks for your understanding, enthusiasm and working closely with Office 365. Moreover, if our community members have related experience on this issue, especially the 3rd party related solutions, I will appreciate it if they’ll share some information on this scenario.
Best regards,
Young Yang