❔ Custom validation attribute not displaying validation message

<EditForm EditContext="_merchantContext" class="create-link-form">
            <DataAnnotationsValidator />

            <div class="form-control">
                <Name For="() => _merchant.EmailAddress" />
                <InputText type="text" @bind-Value="_merchant.EmailAddress" placeholder="[email protected]"/>
                <ValidationMessage For="() => _merchant.EmailAddress" />
            </div>

            <div class="form-control">
                <Name For="() => _merchant.Iban" />
                <InputText class="uppercase" type="text" @bind-Value="_merchant.Iban" placeholder="SKXX XXXX XXXX XXXX XXXX XXXX" />
                <ValidationMessage For="() => _merchant.Iban" />
            </div>
        </EditForm>

private void SubmitPart(EditContext context) {
        var result = context.Validate();

        if(!result) {
            _isSubmitting = false;
            return;
        }

        GoTo(_currentPage+1);
    }