Thanks so much, as it turned out I could only fetch one email ID for the duplicate ones. My guess is that the unconfirmed one that I couldn’t remove didn’t yet got listed with that ID? It is probably a bit in the air with an incomplete validation process?
What I did to resolve was switch the primary to the 2 alternate e-mail address. The unconfirmed duplicate could still not be deleted but when I deleted the confirmed (now former-primary email) also the unconfirmed duplicate one got removed.
Then added the original email address as a secondary and then switched it to be the primary.
All sorted and learned a lot in the process 