Can sign into Apple.com but cannot sign into icloud.com on Windows Firefox

I tried to sign into my icloud.com account on Windows desktop firefox browser many times today without success. I know I entered the correct password, but icloud always said the password is wrong. I even tried to change the password on my iphone and sign in again with the new password on icloud, it still always says the password is wrong. Every time after sign in failed on windows firefox, my iphone would ask me if I allow signing in elsewhere, I clicked allow and it would pop up with a Verification code. However on the Windows desktop, icloud.com never asks me for a Verification code. There is no option to enter the verification code anywhere. The only 2 option is password or passkey. The correct password always come back with failed. I also tried sign in with passkey many times. I used my iphone camera to scan the QR code on the desktop, clicked on the link, desktop changed the prompt to show that it is communicating with my iphone waiting for approval, I verified the facial scan and everything went fine on the iphone side, but the windows desktop will still say verification failed!

This is ridicules, correct password and correct iphone passcode both fails on the icloud. What is more ridicules is that I am then able to sign into apple.com with the passcode and get to this forum fine on the same windows firefox, but I still failed to login to icloud.com in the same browser using the same method. I think icloud have a bug. Please fix ASAP! or please tell me how to get into icloud!