The simplest way to update your SSL certs in ADFS is via AzureAD Connect.

From Twitter by Samuel Devasahayam | @MrADFS

https://docs.microsoft.com/en-us/azure/active-directory/connect/active-directory-aadconnectfed-ssl-update

Group Program Mgr in the Identity division @ Microsoft. Work on ADDS/ADFS, Azure AD Domain Services, AzureAD Connect/Health & Conditional Access. Music lover.

Seattle

blogs.msdn.com/b/samueld