After following all of the steps here Unreal Engine on GitHub I still am not receiving an email invitation, and do not have access to the unreal engine source code.
I have tried, unlinking, relinking, deleting the OAUTH etc, and nothing has worked.
We are still investigating this issue, but in the meantime, I would like to see if we can find a workaround, so you will be able to receive the invites. Can you please try following the steps on this linkagain, but this time on a Microsoft Edge Browser , to see if you will now be able to receive the invites?