can't sendkeys in login UI

[loisalex]

Dear openfin experts,

I faced a issue below, hope your resolution, thanks.

issue description:
when navigate to my login page(window) after get driver successfully, i can find element(username), but sendkeys('124') not works. there is no error, it seems windhandle can't control my UI element(login UI)

code:
selenium.WebDriver driver
driver.navigate().to("http://****:8087/login.html");
Actions actions = new Actions(driver);
WebElement login=driver.findElement(By.id("username"));
login.sendKeys(Keys.CONTROL,Keys.chord("a"));
login.sendKeys(Keys.BACK_SPACE);
actions.moveToElement(driver.findElement(By.id("username"))).sendKeys("124").perform()

my application window information:
{
"uuid": "app_shell",
"name": "app_shell",
"url": "http://:8087/provider.html",
"parentName": "app_shell",
"parentUUID": "app_shell",
"childCount": 1,
"windowInfo": {
"size": "533w333h",
"position": "(7,7)",
"monitor": ""
},
"showing": false,
"subRows": [
{
"uuid": "fmo_app_shell",
"name": "internal-generated-window-d7fc4026-396d-4f73-88e7-4b278c41afd5",
"url": "http://*:8087/login.html",
"parentName": "app_shell",
"parentUUID": "app_shell",
"childCount": 1,
"windowInfo": {
"size": "400w374h",
"position": "(153,440)",
"monitor": ""
},
"showing": true
}
]
}

[loisalex]

when start app there is a background service that only can be controlled by chrome driver
notification service:
https://cdn.openfin.co/release/system-apps/notification-center/1.11.0/provider.html
https://cdn.openfin.co/release/system-apps/notification-center/1.11.0/toast.html
https://cdn.openfin.co/release/system-apps/notification-center/1.11.0

[loisalex]

does only debug mode app support selenium?