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Skype for Business Mobile App + Smart Card Required
I'm using Skype for Business via my Office365 subscription and my domain in Office365 is federated against my on-prem ADFS-infrastructure. My user in the local AD have the option "Require Smart Card ...
MA will not help in this case has the Skype Business Mobile app will still require to enter a username and password.
Unfortunatelly the mobile client doesnt support auth methods different from username/password, as Jean-Philippe Breton mentioned above.
The table in the link i pasted seems to indicate CBA is supported for SfB Mobile when using SfBO.
Also this link here shows the supported topologys for Modern Auth which includes CBA for SfBO in the first table - Cloud Only. This is probably the best link on Technet for understanding the technical nuances between each topology and whats available with each.
https://technet.microsoft.com/en-us/library/mt803262.aspx