java selenium cant find iframe path

i'm trying to get into iframe, but i get error like this:

Find element :By.id: fullscreen-app-host
Find element :By.id: fullscreen-app-host
Get Exception: no such element: Unable to locate element: {"method":"css selector","selector":"#fullscreen\-app\-host"}

and here is iframe css:

<iframe class="publishedAppIframe" tabindex="0" aria-hidden="false" id="fullscreen-app-host" scrolling="no" frameborder="0" name="fullscreen-app-host" allow="geolocation; microphone; camera; fullscreen" style="" title="holidays" cd_frame_id_="6a1f85c52ae"></iframe>

i have tryied many different ways, but result always almost the same - can't find element into iframe.

here i paste link to code of methods i use: https://www.codepile.net/pile/7eygVLY3