Azure: Creating Linux VM returns Required parameter 'osProfile.computerName' is missing (null)

I'm trying to run a very trivial PowerShell script to create a Linux VM in Azure.

Script looks like this:

$LocationName = "switzerlandnorth"
$ResourceGroupName = "my_group"
$SecurePassword = ConvertTo-SecureString "secret" -AsPlainText -Force
$Credential = New-Object System.Management.Automation.PSCredential ("user1", $SecurePassword);

$VirtualMachine = New-AzVMConfig -VMName "testvm" -VMSize "Standard_B2s"
$ComputerName = "testvm-dec2024"
$VirtualMachine = Add-AzVMNetworkInterface -VM $VirtualMachine -Id "/subscriptions/xxxxxx/resourceGroups/Production/providers/Microsoft.Network/networkInterfaces/yyyyy"
$VirtualMachine = Add-AzVMSshPublicKey -VM $VirtualMachine -Path "/home/xxxx/.ssh/authorized_keys" -KeyData "xxxxxx"
$VirtualMachine = Set-AzVMOperatingSystem -VM $VirtualMachine -Linux -ComputerName "test" -Credential $Credential
$VirtualMachine = Set-AzVMSourceImage -VM $VirtualMachine -PublisherName "canonical" -Offer "0001-com-ubuntu-minimal-jammy" -sku "minimal-22_04-lts-gen2" -Version "latest"

New-AzVM -VM $VirtualMachine -ResourceGroupName $ResourceGroupName -Location $LocationName -Verbose

I'm getting this error, which I suspect doesn't reflect the actual cause of the failure, given that ComputerName is defined as a hardcoded string:

Line |
  20 |  New-AzVM -VM $VirtualMachine -ResourceGroupName $ResourceGroupName -L …
     |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Required parameter 'osProfile.computerName' is missing (null). ErrorCode: InvalidParameter ErrorMessage: Required parameter 'osProfile.computerName' is missing (null). ErrorTarget: 
     | osProfile.computerName StatusCode: 400 ReasonPhrase:  OperationID : xxxxxx

I've reinstalled the Azure PS modules from scratch, just to make sure there wasn't an issue with the version I was using.

Has anybody bumped into a similar issue before?

Solution

The error you encountered occurred because both the username and password were provided along with the SSH key. You cannot use both methods at the same time; you must choose either the username and password or the SSH key

Here is the updated PowerShell script to create an azure Linux VM

 $LocationName = "Australia East"                                                                                                                                          
 $ResourceGroupName = "venkat-RG"
 $SecurePassword = ConvertTo-SecureString -String "Welcome@123$" -AsPlainText -Force
 $Credential = New-Object System.Management.Automation.PSCredential ("Venkat", $SecurePassword); 
 $ComputerName = "ContosoVM122"
 $VirtualMachine = New-AzVMConfig -VMName "testvm" -VMSize "Standard_B2s"
 $VirtualMachine = Add-AzVMNetworkInterface -VM $VirtualMachine -Id "/subscriptions/sub_ID/resourceGroups/venkat-RG/providers/Microsoft.Network/networkInterfaces/linux-vm"
 #$VirtualMachine = Add-AzVMSshPublicKey -VM $VirtualMachine -KeyData "xxxx" -Path "/home/vallepu/.ssh/authorized_keys"
 $VirtualMachine = Set-AzVMOperatingSystem -VM $VirtualMachine -Linux -ComputerName $ComputerName -Credential $Credential
 $VirtualMachine = Set-AzVMSourceImage -VM $VirtualMachine -PublisherName "canonical" -Offer "0001-com-ubuntu-minimal-jammy" -sku "minimal-22_04-lts-gen2" -Version "latest"
 New-AzVM -VM $VirtualMachine -ResourceGroupName $ResourceGroupName -Location $LocationName -Verbose

Output:

enter image description here

Reference: Set operating system properties for a new Linux virtual machine