First what is the Make & Model of your GPU card? Does it support Freeysnc?
Your Samsung Monitor specs does show it is compatible with Free sync Premium.
Sounds like a configuration issue if your GPU card supports Freesync feature.
Read this AMD Freesync FAQ and see if there is any information that might help you solve your configuration issue: https://www.amd.com/en/support/kb/faq/dh3-013
AMD FreeSync Premium
- At least 120hz refresh rate at minimum FHD resolution
- Support for low framerate compensation (LFC)
- Low latency
Note: The steps outlined in this article are based on AMD Software: Adrenalin Edition 22.3.1 (Full Install) and the screenshots used are for illustrative purposes only. Depending on your system configuration, some options and settings may not be available to you or exactly as shown in the examples provided.
Also make sure on your Samsung Monitor settings you have Freesync Premium enabled and for PC input.