You only need emails in the Submission form that you filled to participate the Jam.
Look at our game, no emails there:
https://shadowriverue4.itch.io/cats-landing
https://itch.io/jam/2019-epic-megajam/rate/517980
Open your game's page:
https://itch.io/jam/2019-epic-megajam/rate/521356
There will be the button (Edit this submission):
There will be a field for them:
We are looking for the best email address in which to contact you. This does not need to be your Epic Games account email. (This information will be kept private.)
Make sure your emails there.