@abuttino there was a really long thread a while back about - android seems to be very problematic with trusting CAs
https://forum.netgate.com/topic/180369/freeradius-eap-tls-android-13
Only android I had to work with was a lenovo tablet.. Using an older version of android.
I use eap-tls with chromebook and ios phones and tablets and my windows pc without any issues.