DeleteHostChatMessages.java

//Setup driver
WebDriverManager.chromedriver().setup();
driver = new ChromeDriver();
driver.manage().window().maximize();
driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
driver.get("https://teams.microsoft.com/_?culture=en-in&country=IN&lm=deeplink&lmsrc=NeutralHomePageWeb&cmpid=WebSignIn#/conversations/19:meeting_NjAwYzNjMjYtZWIwYy00ODczLTg0YzMtNjEyNzI3YzdlZmRi@thread.v2?ctx=chat");

//Keep a breakpoint on below line and login to your account, open Chat and hit resume F8
//Identify Time on chat, only chat started by host will be identified
List<WebElement> chatOriginsList = driver.findElements(By.xpath("//*[starts-with(@data-scroll-id,'8:orgid')]/div/thread/div//*[@id='messageBody']//*[@data-tid='messageTimeStamp']"));
		
for (WebElement chat : chatOriginsList) {
    	//get the timestamp of chat which is about to be deleted
	System.out.println(chat.getAttribute("title"));
	
	
	//perform mouse hover action on the chat bubble 
	Actions action = new Actions(driver);
	action.moveToElement(chat);
	action.build().perform();

	//click on 3 dots on popover menu
	driver.findElement(By.xpath("//*[@id='messageActions']/message-actions")).click();
	Thread.sleep(1000);
	
	//click on delete
	driver.findElement(By.xpath("//*[@id='messageActionDropdown']/ul/li[3]/button/span")).click();
	Thread.sleep(1000);
}

driver.quit();