zabbix_sender fail on discovered hypervisor

[andrea.g.els]

I'm trying to send data to a trapper item on a auto discovered item , one esxi hypervisor.

Zabbix is 3.4.8

trying with both the syntaxes from the zabbix server :

zabbix_sender -z $zbx_server_ip   -p 10051  --tls-psk-identity PSK_001 --tls-connect psk --tls-psk-file /etc/zabbix/zabbix_agentd.psk -s 00000000-0000-0000-0000-0cc47a418740 -k zabbix.test -o 0 -vv
zabbix_sender -z $zbx_server_ip   -p 10051  --tls-psk-identity PSK_001 --tls-connect psk --tls-psk-file /etc/zabbix/zabbix_agentd.psk -s esxi1.$mydomain.net  -k zabbix.test -o 0 -vv

I've got this error :

zabbix_sender [7206]: DEBUG: In zbx_tls_init_child()
zabbix_sender [7206]: DEBUG: OpenSSL library (version OpenSSL 1.0.1e-fips 11 Feb 2013) initialized
zabbix_sender [7206]: DEBUG: zbx_tls_init_child() loaded PSK identity "PSK_001"
zabbix_sender [7206]: DEBUG: zbx_tls_init_child() loaded PSK from file "/etc/zabbix/zabbix_agentd.psk"
zabbix_sender [7206]: DEBUG: zbx_tls_init_child() PSK ciphersuites: PSK-AES128-CBC-SHA
zabbix_sender [7206]: DEBUG: End of zbx_tls_init_child()
zabbix_sender [7207]: DEBUG: In zbx_tls_connect(): psk_identity:"PSK_001"
zabbix_sender [7207]: DEBUG: zbx_psk_client_cb() requested PSK identity "PSK_001"
zabbix_sender [7207]: DEBUG: End of zbx_tls_connect():SUCCEED (established TLSv1.2 PSK-AES128-CBC-SHA)
zabbix_sender [7207]: DEBUG: answer [{"response":"success","info":"processed: 0; failed: 1; total: 1; seconds spent: 0.000020"}]
info from server: "processed: 0; failed: 1; total: 1; seconds spent: 0.000020"
sent: 1; skipped: 0; total: 1

so the hanshake seems to complete succesfully but the sendo operation fail.
here's the item :

and the host:


any clue?