Did you recently add your work e-mail to your device? Sometimes IT departments put restrictions for devices that have access to their e-mail servers, and this is one that Admins like to disable as it not as secure as a pin or password. Check with your IT department if have your work e-mail going to your smart phone (even if it has been there for a while as they may have recently added this restriction).
Thanks for reaching out for assistance.
I will gladly help with resolving your pattern lock screen concerns.
Let's try a few troubleshooting steps to see if it resolves the issue you are experiencing.
Boot your device in Safe Mode:
Click on this article here: https://www.samsung.com/ie/support/mobile-devices/how-to-start-my-galaxy-device-in-safe-mode/
*Note: the link above is for an international device, but the steps should be the same for US devices.*
Wipe Cache Partition:
1. Connect the device with the computer by the USB Type C and push Volume Down + Power button to switch off your phone.
2. Then press Volume Up and Power key for a short while.
3. Let go of all buttons if you see the SAMSUNG logo.
4. Now use Volume keys to select Wipe cache partition and confirm with the Power button.
5. In the next step go to Yes option.
6. At last, choose Reboot system now by using the Power button.
Make sure your device is up-to-date with the latest software.
Click on this link here: https://www.samsung.com/us/support/answer/ANS00077582/
Make sure your data is fully backed up to a cloud before performing this step, so there will be no data lost.
Click on this article: https://www.samsung.com/us/support/answer/ANS00062029/
If you are still experiencing these symptoms after the troubleshooting provided. I would recommend a service repair on your device.
Please feel free to reach out to us directly via one of the following options and include a link to this thread:
Facebook Messenger: http://m.me/samsungsupport
Or you can use the following link below to request service through mail-in or one of our walk-in service centers. https://www.samsung.com/us/support/service/
Private Message: http://bit.ly/2GGYul4
Contact Customer Service directly at 1-800-726-7864