EAP-TLS - Cannot use imported client certificate with android

Hello,

I tried to reproduce the tutorial at https://wiki.mikrotik.com/wiki/Manual:Wireless_EAP-TLS_using_RouterOS_with_FreeRADIUS in order to enable EAP-TLS.
As result I get all the certificates, but after I imported them to the most current version of android I was able to select the CA certificate in the Wifi menu but not the client certificate. I even tried concatenating the client cert with the client key, but it didn’t work neither.

I am using cAP ac as AP with ROS 6.45.3 and freeradius 3.0.12

Can anyone confirm that the tutorial works? If this is the case I have to study more to find my error. I just want to exclude the propabillity of an error in the tutorial.

Best regards,
Solero