For Android >= 7.0,the certificate will be installed by USER but SYSTEM.
So after exporting fiddler certificate to desktop,you need to transfer it to another form.
Use openssl x509 -subject_hash_old -in 123.pem and adb push ab6544ad.0 /system/etc/security/cacerts/
Don't forget to type adb shell setprop debug.firebase.analytics.app com.google.firebase.quickstart.analytics and adb logcat -v time -s FA FA-SVC
GOOD LUCK :)