Hello @William Albert Byrd ,
As per the message , this is temporary due to high demand for that SKU in those regions.
Take a look at the below document which shows in which regions NCasT4v3 is supported
https://azure.microsoft.com/en-us/global-infrastructure/services/?products=virtual-machines®ions=all
Based upon your requirement, try requesting for the quota in the corresponding region.
Regards,
Shiva.