Hello David-120_, thank you for posting. Welcome to the Samsung Community. There are things you can do if you notice an unknown sign-in or hack to your Samsung Account.
Here is how to check if there are unauthorized activity from mobile devices.
Step 1. Go to device settings and tap your Samsung account profile.
Step 2. Tap “Devices” to check if there is any action in your account that you did not authorize.
If your account was accessed without your consent please enhance your security. Add a Two-step verification.
For information on what to do if there is unknown sign-in activity or hacking in your Samsung account please visit the following website: https://www.samsung.com/ph/support/apps-services/-what-to-do-if-an-unknown-sign-in-or-hacking-attemp...