TAB key not working in Pop up window in CEP extension

Hi,

We are using CEP capabilities for implementing SSO in our InDesign plugins. This is how the screen appears when the extension navigates to the configured IDP. 

As seen, the IDP opens up a pop-up which asks the user to enter their creds. This is where I am running into an issue. 

Once the user enter their username, they are unable to use TAB key to move into the password field. They are forced to use the mouse. The TAB key however works when used from actual chrome browser.

I am trying to investigate this from possible CEF command line paramters that I can pass using the extension manifest.

Is there any other possible viewpoint to consider this issue from for a potential solution?

Please advice.