This issue was resolved around 12:00am EDT on Friday August 20, 2021. Users who were blocked should have now received the invitation email. If the original invitation has timed out, please try following these additional steps shared by a user (thanks g-canter)
- Leave the epic organization in github
- Revoke the Oauth access in github
- Unlink your unrealengine and github account from unrealengine
- Re-link the accounts
- After that you’ll get the repo invite again and it should give you full access now.
Epic will be performing a full review of how this incident occurred, and take additional steps to ensure it does not occur again in the future.
Thank you