Hi @Toby Tan ,
it looks like the VM SKU NC6 Promo isn't available in the Azure region Southeast Asia:
I see two options: Use a different VM SKU or a different Azure region.
Did you try to create a VM using the VM SKU NC6 Promo via Azure portal? This works?
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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten