I have discovered that the reset & change password fields will auto-crop pasted passwords. It cuts your password to about 16 chars. If you are using a long password, and a password manager it will allow you to paste a password that is longer ONLY in the change password box. The login form still accepts values greater than their accepted password length. If you are using a password manager try a sub-string from your password of around 16 chars. That is what worked for me after weeks of this issue.
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