How to get content of a webpage that requires authentication Selenium

The reason is, that the content in the login window is shown within an <iframe>, and Find Elements will not operate into the <iframe>:

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What you’ll have to do after opening the login window:

  1. Get the <iframe> using a Find Elements node (use e.g. an ID query iframe_login, or XPath //*[@id='iframe_login'])

  2. Use the Frame node, check ‘WebElement’ and select the <iframe> column from previous step

  3. Continue with your existing workflow

In case you need to ‘escape’ from the <iframe> later, you can use another Frame node with the option ‘Back to parent frame’ or ‘Default content’.

Does that help?