MudCodeInput - MudInput.FocusAsync: ElementReference has not been configured correctly.

[MarkHorton56]

Blazor server side error reported MudInput.FocusAsync: ElementReference has not been configured correctly given the below configuration and all 6 fields completed; pressing tab or moving focus with cursor causes the error to repeat.

The code here needs check the length does not exceed the Count value.

Suggest
int focusIndex = Math.Min(Count-1, str.Length);

<MudCodeInput Class="login"
                              InputType="InputType.Number"
                              T="string"
                              @bind-Value="@_inputCode"
                              Count="6"
                              Spacing="2"
                              Variant="Variant.Outlined"
                              Margin="Margin.None"
                              Required="true"/>