My device is running Android 5.0 Lollipop or above and I have forgotten my lock screen password. After trying multiple times without luck, I do not see an option to reset my password using my Google account credentials. Why is this option not appearing?
This option seems to be have removed by Google in Android 5.0 and above and there is no longer an official way to reset your lock screen password.
Resetting your password using Android Device Manager also often fails as there is already a screen lock set.
Check the locked-out tag for information that may help with your issue.
Even Google gives unlocking instructions only for Android Kitkat and below. For Lollipop and above, the indirect recommendation seems to be about resetting or erasing the device.
Chris Hoffman on How to Geek reports:
[Screen lock resetting] feature was removed in Android 5.0. Unfortunately, this means there’s no built-in way to simply reset your pattern, PIN, or password and gain access to your phone or tablet. This does help provide additional protection to your data, however — attackers have no way of bypassing the passcode unless they actually know it.
Other than resetting through recovery, Settings app and from Google Device Manager, I found the following info worth mentioning:
Android’s Smart Lock feature may be able to save you. For example, let’s say you’ve set up Smart Lock on your Android phone and have it automatically log in when it’s on your home Wi-Fi. You can take your phone to that home Wi-FI network and it will automatically unlock for you, even if you can’t remember the normal unlock code.