Didn't receive a mail from Nintendo?

So, I want to change the email address from my Nintendo account, since my current one is an old one that I no longer use. If you want to change emails on Nintendo, send one code to the current one and one to the new one. But I don't get an email on my new one. I did everything as I said, but I don't get anything. Both emails are at Web.de.

Go to the web.de page directly via the browser and log into your account. Then you look there in the SPAM / JUNK folder. Maybe the mail ended up there.

I've already done everything. There's nothing there.

I even saved the email from Nintendo as a contact, as I said, but still nothing arrives.

Then please contact Nintendo Support.