Cannot change email account where copy send to

I have a Adobe DC account to sign documents but i cannot change the primary email.

Every time i send a sign request it sends me a message that a copy has been send to a old@email adres (that is not used anymore).

I removed my account fully and after a few days i create a new account with the new@email adres.

But still i get the message that a copy has been send to my old@email adres.

Does anyone now where i can change that email adress?

It's the adress that is used to send copy's to, like the primary admin account.