Question Iron Source Account is not verified, Who Else?

I created an Iron Source account a week ago because mediation is currently not working for me with Android and is deprecated anyway.

Unfortunately, Iron Source is unable to verify my account. For a week now they have been writing to me every day that I should "only reply to their email once more to confirm my account". As soon as I do that, I get another email with the same content the next day.

Has this worked better for any of you?
Is there some trick I don't see?