SNMPv3 Poller response noSuchInstance

[rich_h]

I am trying to test a Zabbix server but I don't seem to be able to get the Discovery Poller to work. It is polling, but I get a different response to the query from the Poller than I do manually polling using snmpwalk. I am polling OID: 1.3.6.1.2.1.1.5
Zabbix Version 4.2.5, running on freshly installed Centos 7.

snmpwalk -v3 -l authPriv -u SNMP_USER -a sha -A PassW0rd-x aes -X PassW0rd 192.168.1.253 .1.3.6.1.2.1.1.5
SNMPv2-MIB::sysName.0 = STRING: sw-office.localdomain

I have decrypted pcaps of the snmpwalk and the discovery probe. The response from the Zabbix probe is:

msgData: encryptedPDU (1)
    encryptedPDU: 14a49dcd720e89029f345a70491aa3b40aa99d44b5268619...
        Decrypted ScopedPDU: 302d040c800000090300381c1af858010400a21b02044dbe...
            contextEngineID: 800000090300381c1af85801
                1... .... = Engine ID Conformance: RFC3411 (SNMPv3)
                Engine Enterprise ID: ciscoSystems (9)
                Engine ID Format: MAC address (3)
                Engine ID Data: Cisco type: Agent (0x00)
                Engine ID Data: MAC address: Cisco_f8:58:01 (38:1c:1a:f8:58:01)
            contextName:
            data: get-response (2)
                get-response
                    request-id: 1304304023
                    error-status: noError (0)
                    error-index: 0
                    variable-bindings: 1 item
                        1.3.6.1.2.1.1.5: noSuchInstance
                            Object Name: 1.3.6.1.2.1.1.5 (iso.3.6.1.2.1.1.5)
                            noSuchInstance
                                [Expert Info (Note/Response): noSuchInstance]
                                    [noSuchInstance]
                                    [Severity level: Note]
                                    [Group: Response]

Both get-requests look the same, but something must be different to get a different result.

Request from Zabbix:

Simple Network Management Protocol
    msgVersion: snmpv3 (3)
    msgGlobalData
        msgID: 1168242253
        msgMaxSize: 65507
        msgFlags: 07
            .... .1.. = Reportable: Set
            .... ..1. = Encrypted: Set
            .... ...1 = Authenticated: Set
        msgSecurityModel: USM (3)
    msgAuthoritativeEngineID: 800000090300381c1af85801
        1... .... = Engine ID Conformance: RFC3411 (SNMPv3)
        Engine Enterprise ID: ciscoSystems (9)
        Engine ID Format: MAC address (3)
        Engine ID Data: Cisco type: Agent (0x00)
        Engine ID Data: MAC address: Cisco_f8:58:01 (38:1c:1a:f8:58:01)
    msgAuthoritativeEngineBoots: 2
    msgAuthoritativeEngineTime: 60607712
    msgUserName: SNMP_USER
    msgAuthenticationParameters: f3faa7aca81046b19e70e6c6
        [Authentication: OK]
            [Expert Info (Chat/Checksum): SNMP Authentication OK]
                [SNMP Authentication OK]
                [Severity level: Chat]
                [Group: Checksum]
    msgPrivacyParameters: 6f26af9d479f467d
    msgData: encryptedPDU (1)
        encryptedPDU: 0b9d7be1b2dc0a77a2fb4eba623c157c3a2585c48cf38193...
            Decrypted ScopedPDU: 302d040c800000090300381c1af858010400a01b02044dbe...
                contextEngineID: 800000090300381c1af85801
                    1... .... = Engine ID Conformance: RFC3411 (SNMPv3)
                    Engine Enterprise ID: ciscoSystems (9)
                    Engine ID Format: MAC address (3)
                    Engine ID Data: Cisco type: Agent (0x00)
                    Engine ID Data: MAC address: Cisco_f8:58:01 (38:1c:1a:f8:58:01)
                contextName:
                data: get-request (0)
                    get-request
                        request-id: 1304304023
                        error-status: noError (0)
                        error-index: 0
                        variable-bindings: 1 item
                            1.3.6.1.2.1.1.5: Value (Null)
                                Object Name: 1.3.6.1.2.1.1.5 (iso.3.6.1.2.1.1.5)
                                Value (Null)

Request from snmpwalk:

Simple Network Management Protocol
    msgVersion: snmpv3 (3)
    msgGlobalData
        msgID: 1694691868
        msgMaxSize: 65507
        msgFlags: 07
            .... .1.. = Reportable: Set
            .... ..1. = Encrypted: Set
            .... ...1 = Authenticated: Set
        msgSecurityModel: USM (3)
    msgAuthoritativeEngineID: 800000090300381c1af85801
        1... .... = Engine ID Conformance: RFC3411 (SNMPv3)
        Engine Enterprise ID: ciscoSystems (9)
        Engine ID Format: MAC address (3)
        Engine ID Data: Cisco type: Agent (0x00)
        Engine ID Data: MAC address: Cisco_f8:58:01 (38:1c:1a:f8:58:01)
    msgAuthoritativeEngineBoots: 2
    msgAuthoritativeEngineTime: 60609929
    msgUserName: SNMP_USER
    msgAuthenticationParameters: 340c7ad41c7ca0fe6e509283
        [Authentication: OK]
            [Expert Info (Chat/Checksum): SNMP Authentication OK]
                [SNMP Authentication OK]
                [Severity level: Chat]
                [Group: Checksum]
    msgPrivacyParameters: 5749ec723cfb3922
    msgData: encryptedPDU (1)
        encryptedPDU: 9e1658e35907f79c1a48830a0a2736b9af0c34cae8531cda...
            Decrypted ScopedPDU: 302d040c800000090300381c1af858010400a11b020432c7...
                contextEngineID: 800000090300381c1af85801
                    1... .... = Engine ID Conformance: RFC3411 (SNMPv3)
                    Engine Enterprise ID: ciscoSystems (9)
                    Engine ID Format: MAC address (3)
                    Engine ID Data: Cisco type: Agent (0x00)
                    Engine ID Data: MAC address: Cisco_f8:58:01 (38:1c:1a:f8:58:01)
                contextName:
                data: get-next-request (1)
                    get-next-request
                        request-id: 851915442
                        error-status: noError (0)
                        error-index: 0
                        variable-bindings: 1 item
                            1.3.6.1.2.1.1.5: Value (Null)
                                Object Name: 1.3.6.1.2.1.1.5 (iso.3.6.1.2.1.1.5)
                                Value (Null)

Can anyone see why Zabbix receives the noSuchInstance response?