If you can't sign in, please check your OS version and Samsung account version. Sometimes, it might be a temporary system error.
You may check how to update your mobile device's software in the following order.
Step 1. Go to Settings > Software update.
Step 2. Tap on Download and install.
Step 3. Follow the on-screen instructions.
You may also check the date and time on your device. For security purposes, Samsung accounts require the date and time to be the same as the actual date and time.
You can also log in to the Samsung account website, and check what devices are authorized to access your account. To do this, select SECURITY from your account’s main page, and then select Two-step verification. Select Trusted device(s), and then select Remove all devices. You will need to sign back into your account on your personal devices, but this will ensure that no one has unintended access to your account.
As an extra precaution, please reset your password and make sure you have two step verification enabled.
If that doesn't fix the problem, you may submit an error report through the Samsung Members app as follows:
Step 1. Long press Samsung Members icon on Apps screen and tap Error reports.
Step 2. Tap OK on agreement popup to send system log data.
Step 3. Select Symptom category "Settings/System".
Step 4. Describe the problem in details and SEND.
If the issue persists, you may bring your device to the nearest Samsung Authorized Service Center in your area. Rest assured that your device will undergo an assessment to pinpoint the root cause of the issue. They may guide you and offer solutions to restore it.
or book an appointment with the Samsung Members app as follows:
Support > Book an appointment to set one.
Should you need further assistance and guidance, you may contact us via our online Samsung Customer Care support channels below.