Hi Uldis, thank you for your advice but I tried it before I made this topic and it didn’t help (I tried with version 9.2.0 10.2.1 11.6.0) same error for all versions, I just want to test FCM Notification with native JAVA code cause your FCM Support on FUSE is not quite suit our purpose. I uploaded my project here please take a look, cause if you don’t know then no one know ^^.