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What is the exact error message you are seeing when you try to unlock your phone?
To recover your Samsung phone, try the following:
Go to https://findmymobile.samsung.com
Log in with the same Samsung account used on your locked device. It may take a few seconds for Find My Mobile to locate your device.
Once your device has been located, click Unlock, and then click Unlock again. Enter your Samsung account password, and then click Next to finish.
Doing this will reset the Lock screen security.