Ah sorry i missed your message. Should’ve sent it to you from another request 
For all of you still following this thread, I thought I’d give it some closure with this article, which I believe might be related to this error, and place it in a wider view. It looks like other global changes are happening, including some policies too, perhaps even related to this one we’re addressing. Epic is changing Unreal Engine’s pricing for non-game developers - The Verge
Linking to another forum,
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It’s working! I just unlinked the accounts and relinked them again and it worked. Thanks!
Update: I received the invitation link, eventually.
Hi there,
It’s …, again.
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 link again, but this time on a Microsoft Edge Browser , to see if you will now be able to receive the invites?
Let me know if it works or not.
Regards,
Epic support asked me to try re-link a GitHub yesterday. I have done it just now. And I received an invitation. And I have an access right now.
I have also cleared epicgames.com cookies and deauthorized Epic in GitHub settings.
It looks like the issue is fixed.