Selenium/java is returning empty text

I have a table and below is the description of the html-row that I am writing selenium test for:

<mat-row _ngcontent-kgo-c23="" class="mat-row ng-star-inserted" role="row">
    <!---->
        <mat-cell _ngcontent-kgo-c23="" class="mat-cell cdk-column-id mat-column-id ng-star-inserted" role="gridcell">
            <a _ngcontent-kgo-c23="" ng-reflect-router-link="/dir,208" href="/claim/208">208</a>
        </mat-cell>
        <mat-cell _ngcontent-kgo-c23="" class="mat-cell cdk-column-firstName mat-column-firstName ng-star-inserted" role="gridcell">
        George
        </mat-cell>
</mat-row>

Here is the test :

List<WebElement> idRows = super.wait(WAIT, INTERVAL).until(driver -> driver.findElements(By.className("mat-column-id")));
webDriver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
//Validate only one row exist in the search result
assertEquals(1,idRows.size());

//The result has is "208" and name "George"
WebElement firstNameInSearchResult = webDriver.findElement(By.className("cdk-column-firstName"));
System.out.println("===========>" + firstNameInSearchResult.gettext()+", " + idRows.get(0));
assertTrue(firstNameInSearchResult.getText().contains("George"));
assertTrue(idRows.get(0).getText().contains(searchId));

The System.out.println is showing empty text. And assertion following that print statement is failing. Am I doing the text validation in right way?