What do you want to achieve? Keep it simple and clear!
A textbox where you can press enter to submit.
What is the issue? Include screenshots / videos if possible!
The only available enter key in the enum list, is the KeypadEnter. This is annoying because the normal enter key cannot be used.
What solutions have you tried so far? Did you look for solutions on the Developer Hub?
Yes, I have looked for solutions, none of them have helped at all.
FocusLost passes 2 arguments, whether enter was pressed and what keycode it was. So, using that argument, you can tell if they pressed enter. Check more out here.