I also have this problem.
Ive entered what i know to be the correct password multiple times, and the phone says my password is wrong. All this started after i updated the phone a couple days ago. I've tried talking to Samsung customer-service about it. Theyre saying that its not possible and that i must have the wrong passoword, and that they cant do anything about it or help (even if I have all info like recoverycodes etc).
I personally suspect the problem has something to do with having multiple language-keyboards installed on the phone. When using the phone earlier I've sometimes experienced e.g. in apps or in the browser that passwords or searches won't work or show up, if I'm using the wrong language-keyboard to type it in with. This hasn't been a huge problem those times since I would've just change back to the correct language-keyboard, and that would usually solve the problem. I use 3 language-keyboards on my phone (im Norwegian and we have 2 written languages + i use a english one for english writing). I've never experienced this problem before with the android sofware tho (exept in the searchbar for emojis in the emoji-option of the keyboards).
My main language-keyboard is the main-norwegian-writing one, which always showed up by default on the lockscreen before the update. After the update it doesn't show up as an option or at all, and only the english and the secondary-Norwegian keyboard are available to use and show up. Furthermore, I dont use any special-characters in my passwords (e.g. æ/ø/å, since they usually aren't allowed in passwords anyways), so my password should work regardless of the language-keyboard -also according to Samsung customerservice, but it still doesn't. Since the phone is locked it also won't allow me to enter the root menu or any other "backdoors".
Samsung plz fix
