SNMP Trap V3 with 'priv' not working

Hi Guys! 

I've got some troubles using SNMP V3 traps with 'priv(acy)'!

My SNMP settings:

####################
view    VIEW30 included .1 
group   GRP30  usm public_v3 
access  GRP30 "" any priv exact VIEW30 none none
createUser public_v3 SHA "12345678" AES "87654321" (<=of course this is in 
persistent file snmpd.conf)

trapcommunity public_v3 
agentSecName  public_v3  
iquerySecName public_v3  
rouser        public_v3 priv  
trapsess -v 3 -l authPriv -u public_v3 -a SHA -A "12345678" -x AES -X 
"87654321" 10.126.8.80

notificationEvent linkUpTrap   .1.3.6.1.6.3.1.1.5.4.0 .1.3.6.1.2.1.2.2.1.1 
.1.3.6.1.2.1.2.2.1.7 .1.3.6.1.2.1.2.2.1.8
notificationEvent linkDownTrap .1.3.6.1.6.3.1.1.5.3.0 .1.3.6.1.2.1.2.2.1.1 
.1.3.6.1.2.1.2.2.1.7 .1.3.6.1.2.1.2.2.1.8
monitor -r 30 -e linkUpTrap "Generate linkUp" .1.3.6.1.2.1.2.2.1.8 != 2    
 
monitor -r 30 -e linkDownTrap "Generate linkDown" .1.3.6.1.2.1.2.2.1.8 == 
2
authtrapenable  1 
####################



My snmptrapd settings:
####################
createUser -e 0x80001f88017f000101 public_v3 SHA 12345678 AES 87654321
authUser log,execute,net public_v3 priv
####################


On Restart of SNMP i receive the correct traps in wireshark ... but why do 
i get authenticationfailure in snmptrapd????
Everything is working fine, when i use e.g. 'auth' instead of 'priv' 
AES/SHA!
I absolutly have no idea what i am doing wrong! (Note: I also send snmp 
trap from an agentx application)

Output of snmptrapd:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (27039) 0:04:30.39 
SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::authenticationFailure 
SNMPv2-MIB::snmpTrapEnterprise.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
2020-11-12 19:37:53 <UNKNOWN> [UDP: 
[10.126.5.6]:41910->[10.126.8.80]:162]:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (27039) 0:04:30.39 
SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::authenticationFailure 
SNMPv2-MIB::snmpTrapEnterprise.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
2020-11-12 19:38:23 <UNKNOWN> [UDP: 
[10.126.5.6]:41910->[10.126.8.80]:162]:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (30041) 0:05:00.41 
SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::authenticationFailure 
SNMPv2-MIB::snmpTrapEnterprise.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
2020-11-12 19:38:23 <UNKNOWN> [UDP: 
[10.126.5.6]:41910->[10.126.8.80]:162]:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (30041) 0:05:00.41 
SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::authenticationFailure 
SNMPv2-MIB::snmpTrapEnterprise.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
2020-11-12 19:38:53 <UNKNOWN> [UDP: 
[10.126.5.6]:41910->[10.126.8.80]:162]:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (33043) 0:05:30.43 
SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::authenticationFailure 
SNMPv2-MIB::snmpTrapEnterprise.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
2020-11-12 19:38:53 <UNKNOWN> [UDP: 
[10.126.5.6]:41910->[10.126.8.80]:162]:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (33043) 0:05:30.43 
SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::authenticationFailure 
SNMPv2-MIB::snmpTrapEnterprise.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10


Can you please help / tell me what I am doing wring?

Thank you very much,
Martin

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