@WardH Apologies for all the delay in response and all the inconvenience caused because of the issue.
I got below response from our internal team:
They need to ask for quota for the Dasv4 VM family
Subscription->Usage and quota->Request quota increase
And then, pick the DASV4 family
If you have any Support Plan will request you to open Support Request with Microsoft otherwise let me know I will help you to open a One Time Free Technical Support.
Hope it helps!!!
Please "Accept as Answer" if it helped so it can help others in community looking for help on similar topics.