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You’re running into VM-size availability or quota issues in the Azure portal (you see “Size not available” next to certain SKUs).
Here’s what you can try:
- Check regional availability
- In the portal, go to your VM > Settings > Size. Any size not listed (or marked “Size not available”) simply isn’t offered in that region for your subscription.
- You can also run:
to see all SKUs available in that region.az vm list-skus --location <your-region> --output table
- Review your quotas
- In Azure Portal, search for “Usage + quotas” under your subscription or resource group and verify you haven’t hit a vCPU or core quota.
- CLI:
az vm list-usage --location <your-region> --output table - If you’re at quota, click “Request increase” or open a support request.
- Try an alternative size or region
- If your desired size isn’t available, pick a different SKU in the same family or deploy in another nearby region.
- When resizing an existing VM: stop the VM first (portal or
az vm stop), change the size, then start it again.
- Troubleshoot allocation failures
- Sometimes the cluster or availability set simply can’t allocate that size right now. Stopping all VMs in the set, then recreating or resizing can help.
- Review allocation-failure guidance if you see errors like
AllocationFailed.
- Use ARM templates or CLI for repeatable deployments
- If you automate VM creation with ARM/CLI, you can programmatically check for available SKUs or fall back to an alternate size.
Reference list:
- Common issues: Unavailable virtual machine SKU https://learn.microsoft.com/azure/cyclecloud/common-issues/unavailable-sku?view=cyclecloud-8&wt.mc_id=knowledgesearch_inproduct_azure-cxp-community-insider#possible-error-messages
- My desired region or VM size is unavailable https://supportabilityhub.microsoft.com/solutions/apollosolutions/95bc1151-aabb-e35b-f91a-1b699d0bfa9a/e0a1e9a7-99b8-40f6-9de7-f25de26ce4f0
- Need guidance resizing my VM https://supportabilityhub.microsoft.com/solutions/apollosolutions/96948be6-5533-4762-9731-64f11087e061
- Windows VM deployment top issues https://learn.microsoft.com/troubleshoot/azure/virtual-machines/windows/windows-vm-deployment-top-issues?wt.mc_id=knowledgesearch_inproduct_azure-cxp-community-insider
- Linux VM deployment top issues https://learn.microsoft.com/troubleshoot/azure/virtual-machines/linux/linux-vm-deployment-top-issues?wt.mc_id=knowledgesearch_inproduct_azure-cxp-community-insider
If you have any further queries, let me know. If the information is helpful, please click on Upvote and Accept Answer on it.