Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
Those are two different quota dimensions. The “0 of 30” Pv4 value is the per-family allowance, while the deployment is being blocked by the regional Total VMs limit. A family allowance cannot be used when the total limit is zero, so changing from P0V4 to P0V3 will not help.
Seeing the same result in multiple regions strongly suggests an offer/subscription eligibility restriction, although each region still has its own quota. Check the subscription’s offer type under Subscriptions > Overview. Microsoft states that Azure Free Account and Azure for Students subscriptions are not eligible for quota increases. If that is your offer, upgrading to Pay-As-You-Go is the practical route for a dedicated App Service plan.
If this is already a paid subscription, open Help + support > Create a support request, choose Service and subscription limits (quotas), then App Service. Include the subscription ID, target region, exact SKU, requested instance count, and the failed quota-request details. Quota/subscription support does not require a paid technical support plan.
F1 uses shared compute, so it does not request a dedicated Premium worker and may work for development/testing. It is not an equivalent workaround for Premium: it has CPU/feature limits, cannot scale out, and has no production SLA.