Welcome to the Blazor feedback portal. We’re happy you’re here! If you have feedback on how to improve the Blazor, we’d love to hear it!>
Thanks for joining our community and helping improve Syncfusion products!
In Blazor KB for newer version
https://www.syncfusion.com/kb/11259/how-to-dynamically-change-the-content-of-blazor-toast
Change at line 33
this.ToastObj.Show();
with
await this.ToastObj.Show();