The Manage and request quotas for Azure resources documentation page states that the default quota depends "on your subscription offer type". The quota doesn't show up in Azure web portal. Is there a way to find out current quota values using SDK, CLI, REST API?
You probably want to try something like this command :
az vm list-usage --location eastus --out table
It would get you the core usage for the region, which is what is important for deployment of resources.
Other choices (az + Powershell) are available here.
Hope this helps!