If an invalid mac address is used in the interfaces table in agent-config.yaml, like this
 
{noformat}
   - name: eno2
       macAddress: 98-BE-94-3F-48-42
{noformat}

it results in the failing to register the Infraenv with assisted-service and constant retries

{noformat}
Aug 28 15:23:37 master0 agent-register-infraenv[4606]: time="2024-08-28T19:23:37Z" level=info msg="Registering infraenv"
Aug 28 15:23:37 master0 podman[4572]: time="2024-08-28T19:23:37Z" level=info msg="Reference to cluster id: 1f38e4c9-afde-4ac0-aa32-aabc75ec088a"
Aug 28 15:23:37 master0 podman[4572]: time="2024-08-28T19:23:37Z" level=info msg="Registering infraenv"
Aug 28 15:23:37 master0 agent-register-infraenv[4606]: time="2024-08-28T19:23:37Z" level=info msg="Added 1 nmstateconfigs"
Aug 28 15:23:37 master0 podman[4572]: time="2024-08-28T19:23:37Z" level=info msg="Added 1 nmstateconfigs"
Aug 28 15:23:37 master0 agent-register-infraenv[4606]: time="2024-08-28T19:23:37Z" level=fatal msg="Failed to register infraenv with assisted-service: response status code does not match any response statuses defined for this endpoint in the swagger spec (status 422): {}"
Aug 28 15:23:37 master0 podman[4572]: time="2024-08-28T19:23:37Z" level=fatal msg="Failed to register infraenv with assisted-service: response status code does not match any response statuses defined for this endpoint in the swagger spec (status 422): {}"
{noformat}

The error above was in 4.15. In 4.18 I can duplicate it and its only marginally better. There is slightly more info due to an assisted-service change, but same net result of retrying continually on the 
Registering infraenv"
{noformat}
Sep 11 20:57:26 master-0 agent-register-infraenv[3013]: time="2024-09-11T20:57:26Z" level=fatal msg="Failed to register infraenv with assisted-service: json: cannot unmarshal number into Go struct field Error.code of type string"
Sep 11 20:57:26 master-0 podman[2987]: time="2024-09-11T20:57:26Z" level=fatal msg="Failed to register infraenv with assisted-service: json: cannot unmarshal number into Go struct field Error.code of type string"
{noformat}

    

 Occcurs both in latest 4.18 and 4.15.26

    

    1. Use an invalid mac address in the interface table like this

{noformat}
      interfaces:
        - name: eth0
          macAddress: 00:59:bd:23:23:8c
        - name: eno12399np0
          macAddress: 98-BE-94-3F-51-33
      networkConfig:
        interfaces:
          - name: eno12399np0
            type: ethernet
            state: up
            ipv4:
              enabled: false
              dhcp: false
            ipv6:
              enabled: false
              dhcp: false
          - name: eth0
            type: ethernet
            state: up
            mac-address: 00:59:bd:23:23:8c
            ipv4:
              enabled: true
              address:
                - ip: 192.168.111.80
                  prefix-length: 24
              dhcp: false

{noformat}

    2. Generate the agent ISO
    3. Install using the agent ISO, I just did an SNO installation.
    

Install fails with the errors:

{noformat}
level=debug msg=infraenv is not registered in rest API
level=debug msg=infraenv is not registered in rest API
level=debug msg=infraenv is not registered in rest API
level=debug msg=infraenv is not registered in rest API
level=debug msg=infraenv is not registered in rest API
level=debug msg=infraenv is not registered in rest API
level=debug msg=infraenv is not registered in rest API
level=debug msg=infraenv is not registered in rest API
{noformat}

    

The invalid mac address should be detected when creating the ISO image so it can be fixed.