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As the title says, keyboard navigation to the filter elements in the datagrid is impossible when using the Filter Bar FilterType.
This is reproducible in your demo located here:
https://blazor.syncfusion.com/demos/datagrid/filtering?theme=bootstrap4&_ga=2.159300856.335644519.1626193851-1850721396.1616689939
I've attached a screenshot with some highlights. Essentially, it should be possible to either move to the filterbar row via tab on the last columnheader element, or move to the filterbar element corresponding to the columnheader via the down arrow.