Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
If the SSL certificate creation is stuck in the notification pane and never completes, this could be due to missing or delayed DNS propagation. If you have double-checked, tools like https://dnschecker.org can help ensure that the TXT record for domain verification is available globally. Also, A or CNAME records point to the Azure App Service.
Sometimes certificate creation may get stuck due to an issue on Azure’s backend, especially with top-level domains.