Unfortunately our service email was hacked a few weeks ago and a lot of spam emails were sent from our server in one day. Therefore the service email has been blocked at some providers (e.g. Gmail/google).
We now have a new email to send automatic confirmations: firstname.lastname@example.org. Hence the confirmations now come. All pending confirmations will now work out bit by bit.
Sorry if something comes twice, and please report if you are still waiting for your confirmation.