Register in Program.cs or Startup.cs before app.Run() :

Syncfusion Generate License Key Update: Ultimate Migration & Registration Guide

Syncfusion license validation works offline, making it suitable for CI/CD environments. Implement license validation during your continuous integration process to prevent licensing errors before deployment.

Renew your trial, upgrade to a commercial subscription, or check if your project qualifies for the free Syncfusion Community License. Best Practices for Managing Syncfusion Licenses