I’m not sure what happened in your case. I tried this exercise, and you have to do an extra click to get the B1 size, but I was able to do so. When I created the vm, this is the data I got:
~ ➜ az vm list
[
{
"additionalCapabilities": {
"hibernationEnabled": false,
"ultraSsdEnabled": null
},
"applicationProfile": null,
"availabilitySet": null,
"billingProfile": null,
"capacityReservation": null,
"diagnosticsProfile": {
"bootDiagnostics": {
"enabled": true,
"storageUri": null
}
},
"etag": "\"1\"",
"evictionPolicy": null,
"extendedLocation": null,
"extensionsTimeBudget": null,
"hardwareProfile": {
"vmSize": "Standard_B1s",
"vmSizeProperties": null
},
"host": null,
"hostGroup": null,
"id": "/subscriptions/DELETED/devops-vm",
"identity": null,
"instanceView": null,
"licenseType": null,
"location": "westus",
"managedBy": null,
"name": "devops-vm",
"networkProfile": {
"networkApiVersion": null,
"networkInterfaceConfigurations": null,
"networkInterfaces": [
{
"deleteOption": "Detach",
"id": "/subscriptions/DELETED/devops-vm876",
"primary": null,
"resourceGroup": "kml_rg_main-6d5635f3bd7d406f"
}
]
},
"osProfile": {
"adminPassword": null,
"adminUsername": "azureuser",
"allowExtensionOperations": true,
"computerName": "devops-vm",
"customData": null,
"linuxConfiguration": {
"disablePasswordAuthentication": true,
"enableVmAgentPlatformUpdates": null,
"patchSettings": {
"assessmentMode": "ImageDefault",
"automaticByPlatformSettings": {
"bypassPlatformSafetyChecksOnUserSchedule": null,
"rebootSetting": "IfRequired"
},
"patchMode": "AutomaticByPlatform"
},
"provisionVmAgent": true,
"ssh": {
"publicKeys": [
{
"keyData": "ssh-rsa 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 generated-by-azure",
"path": "/home/azureuser/.ssh/authorized_keys"
}
]
}
},
"requireGuestProvisionSignal": true,
"secrets": [],
"windowsConfiguration": null
},
"plan": null,
"platformFaultDomain": null,
"priority": null,
"provisioningState": "Succeeded",
"proximityPlacementGroup": null,
"resourceGroup": "KML_RG_MAIN-6D5635F3BD7D406F",
"resources": null,
"scheduledEventsPolicy": null,
"scheduledEventsProfile": null,
"securityProfile": {
"encryptionAtHost": null,
"encryptionIdentity": null,
"proxyAgentSettings": null,
"securityType": "TrustedLaunch",
"uefiSettings": {
"secureBootEnabled": true,
"vTpmEnabled": true
}
},
"storageProfile": {
"dataDisks": [],
"diskControllerType": "SCSI",
"imageReference": {
"communityGalleryImageId": null,
"exactVersion": "22.04.202512181",
"id": null,
"offer": "0001-com-ubuntu-server-jammy",
"publisher": "canonical",
"sharedGalleryImageId": null,
"sku": "22_04-lts-gen2",
"version": "latest"
},
"osDisk": {
"caching": "ReadWrite",
"createOption": "FromImage",
"deleteOption": "Delete",
"diffDiskSettings": null,
"diskSizeGb": 30,
"encryptionSettings": null,
"image": null,
"managedDisk": {
"diskEncryptionSet": null,
"id": "/subscriptions/f0c3bcdd-5ce2-4fa0-8cf3-41559747512b/resourceGroups/DELETED/disks/devops-vm_disk1_fd8ddb558219487cb4cc4b2131989feb",
"resourceGroup": "kml_rg_main-6d5635f3bd7d406f",
"securityProfile": null,
"storageAccountType": "Standard_LRS"
},
"name": "devops-vm_disk1_fd8ddb558219487cb4cc4b2131989feb",
"osType": "Linux",
"vhd": null,
"writeAcceleratorEnabled": null
}
},
"tags": null,
"timeCreated": "2026-01-03T01:14:14.987244+00:00",
"type": "Microsoft.Compute/virtualMachines",
"userData": null,
"virtualMachineScaleSet": null,
"vmId": "08242156-e780-48e9-983d-f0f084a7749a",
"zones": null
}
]