can't set emal in user

Just to be clear, this couldn't be captured via the "API calls to be made to collect data" configuration, correct? It seems that the "extra" data is not wired to pass it back to the user's email property.

That said, as noted above, it seems the task would be to fire a custom call to the /user endpoint within any appropriate event subscriber, and override the email value from there. We may be able to take advantage of GithubAuthManager::requestEndPoint() for this.

If I get more time, I might run a POC to confirm. But, happy to get feedback on this approach before doing so.