Log-in to Nintendo or Google Account?

Hi, I just bought Dead By Daylight for the Switch, but now I can no longer get into my Nintendo Account because I can no longer log in with the email address assigned to the account. I still know the password for the account and Nintendo also accepts it, but I can't call up the code in the next step because Google thinks that the address does not exist as soon as I try to log into the account via G-Mail.

Is there any way to assign my current e-mail to the account or to log in differently?

So first I would write to the support and ask how I can get the account back with other methods. If you already know the password and actually already know the email, then you should actually get the account faster. Or you write to support to get your money back because you bought the game by mistake.

Okay, thanks for the quick reply. ^^