Hi
Its a bug definitely, which can only be solved for now with a workaround
Refer to my post(s) for the present workaround that i suggested for a similar issue
"RV160 SNMP over IPSec VPN tunnel"
https://community.cisco.com/t5/small-business-routers/rv160-snmp-over-ipsec-vpn-tunnel/m-p/4419750/thread-id/41525/highlight/true
The same workaround steps are valid for your case with forwarding the radius-auth messages over the s2s tunnel (full-tunnel) to the datacenter
- Its also valid when it comes to forwarding syslogs to syslog-server over the vpn tunnel to DC
- Or when you enable DHCP-Relay to a dhcp-server thru the VPN tunnel to DC
hope this solves your issue with the Radius
FYI, this is exactly what i configured on my RV345 too
best regards