Specify controlPlane.architecture as arm64 in install-config
===
controlPlane:
  architecture: arm64
  name: master
  platform:
    azure:
      type: null
compute:
- architecture: arm64
  name: worker
  replicas: 3
  platform:
    azure:
      type: Standard_D4ps_v5

Launch installer to create cluster, installer exit with below error:

time="2024-07-26T06:11:00Z" level=debug msg="\tfailed to reconcile AzureMachine: failed to reconcile AzureMachine service virtualmachine: failed to create or update resource ci-op-wtm3h6km-72f4b-fdwtz-rg/ci-op-wtm3h6km-72f4b-fdwtz-bootstrap (service: virtualmachine): PUT https://management.azure.com/subscriptions/53b8f551-f0fc-4bea-8cba-6d1fefd54c8a/resourceGroups/ci-op-wtm3h6km-72f4b-fdwtz-rg/providers/Microsoft.Compute/virtualMachines/ci-op-wtm3h6km-72f4b-fdwtz-bootstrap"
time="2024-07-26T06:11:00Z" level=debug msg="\t--------------------------------------------------------------------------------"
time="2024-07-26T06:11:00Z" level=debug msg="\tRESPONSE 400: 400 Bad Request"
time="2024-07-26T06:11:00Z" level=debug msg="\tERROR CODE: BadRequest"
time="2024-07-26T06:11:00Z" level=debug msg="\t--------------------------------------------------------------------------------"
time="2024-07-26T06:11:00Z" level=debug msg="\t{"
time="2024-07-26T06:11:00Z" level=debug msg="\t  \"error\": {"
time="2024-07-26T06:11:00Z" level=debug msg="\t    \"code\": \"BadRequest\","
time="2024-07-26T06:11:00Z" level=debug msg="\t    \"message\": \"Cannot create a VM of size 'Standard_D8ps_v5' because this VM size only supports a CPU Architecture of 'Arm64', but an image or disk with CPU Architecture 'x64' was given. Please check that the CPU Architecture of the image or disk is compatible with that of the VM size.\""
time="2024-07-26T06:11:00Z" level=debug msg="\t  }"
time="2024-07-26T06:11:00Z" level=debug msg="\t}"
time="2024-07-26T06:11:00Z" level=debug msg="\t--------------------------------------------------------------------------------"
time="2024-07-26T06:11:00Z" level=debug msg=" > controller=\"azuremachine\" controllerGroup=\"infrastructure.cluster.x-k8s.io\" controllerKind=\"AzureMachine\" AzureMachine=\"openshift-cluster-api-guests/ci-op-wtm3h6km-72f4b-fdwtz-bootstrap\" namespace=\"openshift-cluster-api-guests\" name=\"ci-op-wtm3h6km-72f4b-fdwtz-bootstrap\" reconcileID=\"60b1d513-07e4-4b34-ac90-d2a33ce156e1\""

Checked that gallery image definitions (Gen1 & Gen2), the architecture is still x64.
$ az sig image-definition show --gallery-image-definition ci-op-wtm3h6km-72f4b-fdwtz -g ci-op-wtm3h6km-72f4b-fdwtz-rg --gallery-name gallery_ci_op_wtm3h6km_72f4b_fdwtz
{
  "architecture": "x64",
  "hyperVGeneration": "V1",
  "id": "/subscriptions/53b8f551-f0fc-4bea-8cba-6d1fefd54c8a/resourceGroups/ci-op-wtm3h6km-72f4b-fdwtz-rg/providers/Microsoft.Compute/galleries/gallery_ci_op_wtm3h6km_72f4b_fdwtz/images/ci-op-wtm3h6km-72f4b-fdwtz",
  "identifier": {
    "offer": "rhcos",
    "publisher": "RedHat",
    "sku": "basic"
  },
  "location": "southcentralus",
  "name": "ci-op-wtm3h6km-72f4b-fdwtz",
  "osState": "Generalized",
  "osType": "Linux",
  "provisioningState": "Succeeded",
  "resourceGroup": "ci-op-wtm3h6km-72f4b-fdwtz-rg",
  "tags": {
    "kubernetes.io_cluster.ci-op-wtm3h6km-72f4b-fdwtz": "owned"
  },
  "type": "Microsoft.Compute/galleries/images"
}

$ az sig image-definition show --gallery-image-definition ci-op-wtm3h6km-72f4b-fdwtz-gen2 -g ci-op-wtm3h6km-72f4b-fdwtz-rg --gallery-name gallery_ci_op_wtm3h6km_72f4b_fdwtz 
{
  "architecture": "x64",
  "hyperVGeneration": "V2",
  "id": "/subscriptions/53b8f551-f0fc-4bea-8cba-6d1fefd54c8a/resourceGroups/ci-op-wtm3h6km-72f4b-fdwtz-rg/providers/Microsoft.Compute/galleries/gallery_ci_op_wtm3h6km_72f4b_fdwtz/images/ci-op-wtm3h6km-72f4b-fdwtz-gen2",
  "identifier": {
    "offer": "rhcos-gen2",
    "publisher": "RedHat-gen2",
    "sku": "gen2"
  },
  "location": "southcentralus",
  "name": "ci-op-wtm3h6km-72f4b-fdwtz-gen2",
  "osState": "Generalized",
  "osType": "Linux",
  "provisioningState": "Succeeded",
  "resourceGroup": "ci-op-wtm3h6km-72f4b-fdwtz-rg",
  "tags": {
    "kubernetes.io_cluster.ci-op-wtm3h6km-72f4b-fdwtz": "owned"
  },
  "type": "Microsoft.Compute/galleries/images"
}   

4.17 nightly build    

Always

    1. Configure controlPlane.architecture as arm64
    2. Create cluster by using multi nightly build
    

    Installation fails as unable to create bootstrap/master machines

    Installation succeeds.