WPA3-Enterprise - unknown CA error

[trustno1foxm]

Hello,

I set up freeradius on OPNsense (latest version) and have some problems.
Everything works fine as long as I am going to set "ignore the server certificate" or on mac "trust the server certificate". When I am using WPA3-Enterprise on Windows (for example) I have to select a root certificate. I did an export and installed that certificate on the windows client as root certificate, but it doesn't work. The Freeradius log always tells me "unknown CA".

Any ideas?
Thx!

so long