Hey @Joshua ,
Welcome to the MS Q&A forum.
Looking into the error above, I could see you are trying to deploy the low priority VM in the Availability Zone 1 in the location East US 2.
Error message you are getting means the size is not available in this specific Availability zone. It could be what the size is not available at all for everyone, or there is a restriction in place on your subscription for the size N in AvZone 1 in East US 2.
As a workaround, I'd recommend for you to use a different size, or change the Availability option to "None"
If it's critical for your deployment to have a VM with the specified size in the AVZone 1 in East US2, in this case, I'd recommend for you to use the quota increase process—the same that you use for pay-as-you-go VMs and provide additional details in the description about the AVZone.
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Regards,
Olga