Hi guys, after looking around the forums, I’m 95% certain that this “bug” is actually working as intended. But as a last resort, I wanted to ask this question and make sure I’m not missing anything before I go ahead and take redesign my UI into 2D (I had it fully working in 3D until I started having to test w/ packaged builds HAH!).
So, the issue is with the Text Box widget, and when it’s used in 3D. Normally (i.e. when used in Editor), you are able to click on it and type in text, but the text box is completely non-interactable with a packaged build.
I have tried different methods to confirm that (1) I can manually change the text w/ the SetText nodes, and (2) Setting Keyboard focus DOES NOT work. It’s almost as if they don’t function at all as interactive elements when packaged.
If someone knows if this is something I may expect to get “fixed” in the future or of this is just something I should avoid using altogether, please let me know! 
Cheers~