Hi Paul,
Greetings from Syncfusion Support!
Thank you for reaching out to us with your requirement. We understand that you are attempting to bind a property in a nested complex model, specifically a navigation property that provides a lookup list of countries for the user to select from.
We have thoroughly reviewed your query and prepared a simple sample demonstrating complex data binding with validation. Please take a moment to review the provided sample below:
Sample: https://blazorplayground.syncfusion.com/hNBKMWhXJiFYKExf
However, we would appreciate it if you could provide more specific details regarding any issues you are encountering or any particular aspects of the implementation that are not meeting your expectations. If possible, sharing a screenshot of the issue would be immensely helpful in allowing us to pinpoint and address your concerns accurately.
Your detailed feedback will enable us to provide you with a more tailored and effective solution. We appreciate your understanding and cooperation.
Regards,
Kokila Poovendran.