FortiAP-4xx FR and G series are not discovered by Fortigate 200E/300E

[plsikk]

Hi

I have a weird behavior and can't find the reason.

I have FGT 300E and FAPs 432FR and even if AP got IP address and all wireless controller settings are ok, FortiGate not showing FAP in GUI. If I add it manually then after few sec is online

The same with 432G on 200E. ( FAP os 7.6.2)

On both devices FortiOS is 7.2.10.

I made sniffer and I see 

59.674415 199_MGMT -- 10.24.64.29.15246 -> 10.24.64.1.5246: udp 375
61.565662 199_MGMT -- 10.24.64.29.15246 -> 10.24.64.1.5246: udp 375
62.195526 199_MGMT -- 10.24.64.29.15246 -> 10.24.64.1.5246: udp 375
72.230574 199_MGMT -- 10.24.64.29.15246 -> 224.0.1.140.5246: udp 375
75.612002 199_MGMT -- 10.24.64.29.15246 -> 224.0.1.140.5246: udp 375
78.233103 199_MGMT -- 10.24.64.29.15246 -> 224.0.1.140.5246: udp 375
80.253982 199_MGMT -- 10.24.64.29.15246 -> 255.255.255.255.5246: udp 375
83.655548 199_MGMT -- 10.24.64.29.15246 -> 255.255.255.255.5246: udp 375
86.236722 199_MGMT -- 10.24.64.29.15246 -> 255.255.255.255.5246: udp 375
89.808282 199_MGMT -- 10.24.64.29.15246 -> 255.255.255.255.5246: udp 375
92.239250 199_MGMT -- 10.24.64.29.15246 -> 255.255.255.255.5246: udp 375
95.650793 199_MGMT -- 10.24.64.29.15246 -> 255.255.255.255.5246: udp 375

So FAP is sending capwap packages 

but on third Fortigate I have conencted 431F, 432FR and 234G without any issue. 

Now I'm lost . Any idea about reason and how to troubleshoot ?

What is interesting FAP default profile is also created on FortiGate