Skype for Business(On premise) MFA using thirdparty MFA provider

Hi Team,

I saw Skype for business app/mobile app can be configured for MFA using Modern authentication . I read on Microsoft documentation MFA can be done using Azure AD and ADFS. Is it possible to configure it using any external IDP or federation server sitting on premise without using Azure AD(Cloud). We have vendors like Ping, IBM which supports federation server+MFA capability

I request you to please provide any input you have on this type of integration.

Thanks

Regards,

Devendra