Mobile automation testing

I am trying to test mobile application programming login page. i am using selenium for Learning script on IntelliJ and appium for Earhost inspection. i am trying to sendkeys to most effective email field its not getting input. the wrong idea code i am using for sending keys

driver.findElement(By.id("textinput_placeholder")).sendKeys("Hello@gmail.com") use of case ;

input field is being selected but it United does not send any keys while mobile Modern keyboard popup. i tried to select the ecudated input field before sending keys still no some how luck. i tried to find element by xpath anything else by id by class