Move APX530 from Sophos SG UTM to XGS 136

Hello,

i have a big problem. At the Moment i have a migration from SG UTM 9 tu Sophos XGS.

Everthing works fine, except Wireless.

I disconnected the old Sophos UTM and Connected the Sophos XGS to the LAN. The APX AccessPoints immediatly appears in the list of pending APs.

But when i accept one of them, it remains as inactive and the led remains red. 

I tested this another time in testing enviroment. I works without problems. But now in production the access point never go active or receive the configuration. I don't know how i can fix this.

Is there another way how it has to be done?

Thanks in advanced and sorry for my english

Andreas