I am well aware what Tesla's sw is capable to. Good for you. Go ahead and buy another Tesla. Don't get me wrong, I would buy one, if it would fit my needs. 🙂 I would HAVE to agree that the sw on Lexus is from 1990's or at least that's how it feels like lol. As a person who is working in sw industry this is like a kick in the balls.
Back to the topic and as a tip for anyone else struggling with this. I finally got it to work again...
There is an email + username for the Lexus portal. You are able to use the email (or the username) to login. Now, I have succesfully connected my car with the combination of email + pw, but now I wasn't. I then tried to use only my username (aka lexus id) + pw and TADAAAAA, suddenly it works again, like a charm.