Hi Desmond,
Thanks for contacting Syncfusion support.
We have validated the reported issue for “Blazor components not rendering in Asp Net Core MVC” at our end. Unfortunately, we are unable to replicate the issue at our end. However, we have prepared a sample for your reference in which Blazor Kanban component is rendered in Asp Net Core MVC application. Please find the sample from the below link.
Kindly try with the above sample and if you still face any issue share details like image reference of the issue, issue replicating sample to validate it further at our end.
Regards,
Joshna L