Here are twenty possible reasons why a website hosted on Azure might not load for an end user:

1. Azure service outage or maintenance downtime
2. Incorrect DNS configuration or propagation issues
3. SSL/TLS certificate expiration or misconfiguration
4. Insufficient server resources (CPU, RAM, or disk space)
5. Application code errors or bugs
6. Incompatible platform version (e.g. Node.js, or whatever is used), or missing dependencies
7. Incorrectly configured environment variables
8. Firewall or network security group (NSG) blocking traffic
9. CDN misconfiguration or caching issues
10. Browser compatibility issues or outdated browser
11. User's internet connection problems or ISP issues
12. DDoS attack or high traffic load
13. Incorrectly configured virtual machine scale set (VMSS)
14. Azure subscription suspension or billing issues
15. Incorrectly configured load balancer or traffic manager
16. Missing or misconfigured web.config file for IIS
17. Incorrect application settings in Azure App Service
18. Issues with Azure Blob Storage or other storage services
19. Problems with Azure Active Directory authentication or authorization
20. User's device or operating system compatibility issues