Hello 슬기 김
As per the error message looks like your subscription is not associated with a Cloud Solution Provider (CSP) or that the CSP has not granted you permission to request quota increases.
Here is the troubleshooting document for no eligible subscriptions: https://learn.microsoft.com/en-us/azure/cost-management-billing/reservations/troubleshoot-no-eligible-subscriptions
Quotas are applied per resource group, subscriptions, accounts, and other scopes. Your subscription might be configured to limit the number of vCPUs for a region. If you attempt to deploy a virtual machine with more vCPUs than the permitted amount, you receive an error that the quota was exceeded.
To request a quota increase, go to the portal and file a support issue. In the support issue, request an increase in your quota for the region into which you want to deploy.
Here is an example:
If the above steps won't help contact Azure support directly. Open a support ticket through the Azure portal.