According to the official Fortinet administration guide for FortiOS 7.6.4 under the section " Configuring a RADIUS server, " the supported RADIUS authentication methods you can configure via the CLI with config user radius are:
pap
chap
mschap
mschapv2
auto
The relevant CLI syntax is set auth-type {auto | ms_chap_v2 | ms_chap | chap | pap}. You can confirm this directly in the configuration table and from real CLI sessions.
EAP (Extensible Authentication Protocol) is NOT an authentication option you can directly set under config user radius. EAP methods (such as EAP-TLS, EAP-PEAP, EAP-TTLS) are negotiated between the RADIUS client and server but are not configurable as an explicit auth-type option in FortiOS. EAP authentication is typically used automatically by features like 802.1X, not through the user radius object authentication-type setting, and always requires proper backend workings between supplicant and RADIUS server
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