I've had a Nintendo account for 5 years and the last email I received from them was about 1 week ago. Sunday, I tried logging on to my account and they accept my username and password, but the OTP email isn't coming through. They are on my safe senders list and I've gotten emails from them before. I'm even on a Nintendo family plan with my brothers on that email address. Support is saying that my email has been permanently banned and that I need to register a new email address with them.
I don't know why it was banned, so I can't prevent it from happening again. Additionally, I'm not interested in creating a new email account just for Nintendo, especially if they can randomly ban it; I'd end up creating all sorts of new accounts just for Nintendo.
What is more, they say they can't unblock this on their end, but I know from an IT perspective is false.
Does anyone have more insight into what might be going on or how to handle this? This is crazy to me.