Domain Controller is running on Windows Server 2012R2. Documentation is being followed here
After installation and opening ADFS Management, choosing to Edit Global MFA, there is no option for the Duo Authentication for AD FS, only Certificate Authentication is available.
Troubleshooting steps so far -
Uninstalled and reinstalled the Duo Auth ADFS software as administrator in elevated CMD prompt
Stopped-Started the ADFS Service post-install.
Any help is appreciated!