Hello,
It sounds like you are trying to configure a RADIUS proxy where the NPS server forwards some authentication requests to a remote RADIUS server. This is a fairly complex setup as it involves multiple layers of authentication and configuration.
Remote radius server groups are about some configuration that needs to be forwarded to another NPS server for authentication.
Here are the relevant conditional configurations.
Here are the network policies, which configure some authentication policies.
Here are the conditions for allowing authentication.
Here you can configure the authentication method you want to configure, PEAP or smart card.
I recommend first troubleshooting with the NPS logs. The logs will tell you which policies were matched and why certain decisions were made. If you provide more details about the exact policies and settings, I may be able to provide more targeted advice.
Best Regards
Zunhui