I have followed the instructions to gain access to the github UE4 repository but I never recieved the github invitiation email to EpicGames. I recieved the Epic Games confirmation email that my github account was linked. I’ve tried removing my github username and re-linking. That did not work even though I got the unlink and re-link confirmation emails. I’ve tried logging into the epic games launcher on a windows pc (user suggestion) but that has not worked either.
Same here. Tried emailing support but all I get is an automated email saying that the help address is not monitored /facepalm
Same problem. Did not get any invitation email from github.
I also encountered this problem, but today I can join . you can try again.（Use google translate o(^▽^)o）
Thank you very much. I tried, it worked today.
Thanks for the replies everyone. For anyone finding this post in the future with the same problem, i would just recommend removing and re-adding your github account in your epicgames.com account a couple of times a day until you finally get the github email.
I’m having this exact problem now. 
I have tried many times but it’s still not working：(
I had the same problem but found a solution!
Here’s what I did to receive the email invite to join the EpicGames GitHub repo.
I created a new email address and then created a new GitHub account and a new Epic Games account with it.
Followed the steps to connect my Epic Games account with GitHub but this time I made sure to select the option “Unreal Engine End User License Agreement for Creators” when prompted to accept one of the 2 license agreements.
I suggest trying these steps with your current account first, if that doesn’t work try creating new accounts as I did.
Good luck!