Microsoft Teams login says password is incorrect then and for a captcha

I type it again but fails...

I'm like wtf... Could it be the captcha...

Which I entered in all lowercase

It doesn't say the captcha is case sensitive though..

Next few times it gives me captchas with k... Teehee me like 5 tries to login

Are we trying to verify passwords/humanness or whether I can somehow tell the difference between K and k?