Unable to getElementById on one specific site [closed] - javascript

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Working on creating an auto-login app, but I'm running into a problem on the following site:
https://www.navient.com/loan-customers/
Site Element
<input type="text" id="lblUserId" value .../>
Console Code
document.getElementById('lblUserId').value = 'testUserName';
Error Message
Any ideas why this isn't working? I've tried it on several other sites and it works perfectly.
Thanks ya'll!

the site uses frames. switch above console "top frame" to "ctl16_frlogin"

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Closed 2 years ago.
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Closed 3 years ago.
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When I make display none from developer tool, it works.
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