iCloud: says locked on Tesla browser, but isn't…?

In my car (Tesla, with a browser) I am getting told my account is locked for security reasons. It was previously working just fine and had been for months. Nothing else has changed sfaik, though the car's software does update itself… though now, trivially, as I am not on current hardware.

But my devices are unaffected. I can log in on Safari, and a Chrome Incognito mode window: no lock. In fairness I used a passkey, and did not trigger 2FA.

This happens infrequently but it is not the first time, and I think I guess there is something about logging in to iCloud.com on the Tesla's browser that flags a security concern. I can't know what that is but it's the same account, same car, and same location. The error message doesn't match though: being told my account is locked is very alarming, but what it seems actually to mean is it will not let me log in via this particular browser.

I do not want to reset the password via iforgot: I did this before and it did work, but it ofc very disruptive and I already have a random-but-memorable password which is a pita as it is to have to memorize!

I am also reluctant to do "extreme" troubleshooting as people being locked out of their accounts is real. This is also far from my biggest issue: it's just mildly annoying, mostly because I don't know what is causing it, how long it takes to reset, and ofc I can't use it and it is a nice thing to have. The biggest issue is that I don't like that there is a security flag on my account at all: this is not gift cards or whatever but reading those stories doesn't make me super-happy not to be in their situation, maybe not even their ZIP code, but getting there…

The question is, do other people experience things like this, and is there a way to reset the security flag, or do I just need to wait a few weeks and see?