Hi Ashton,
If you are unable to see the Quotas option under your App Service plan, it might be worth checking If your subscription has changed or if you're on a plan with restricted quotas, the Quotas option might not be available.
You can access the Quotas page by entering quotas
into the search box and selecting Quotas. This page provides a comprehensive view of usage and other quota information for your apps. You can also access the My quotas
section on the Quotas page to view detailed information about your quotas.
Confirm that your account has sufficient permissions to access quota information. You might need roles like Owner, Contributor, or specific Reader roles to view this data.
Please refer below Microsoft documents to get more detailed information on App Service plan quotas and limitations.
https://learn.microsoft.com/en-us/azure/quotas/view-quotas#view-quota-details
https://learn.microsoft.com/en-us/azure/app-service/web-sites-monitor
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Let me know if you have any further Queries.