"OYV" is not the CSC.
The CSC would be what comes after OYV.
You don't need to use any Dialer Code to find this information.
Go to Settings > About Phone > Software Information & Look at Service Provider Software Version.
On my Rogers device it is "RWC".
I forgot to mention, but it is odd that your device is on the February Play System Update. My S20 Ultra One UI V5.1, is on the July Play System Update.
Go to Settings > Security & Privacy > Click on Play System Update & see if at least the July Play System Update is available for your device.
FYI, in case you're wondering why there's an exclamation mark beside "App Security", it's because I don't use Samsung's McAfee "antivirus" software nonsense.
I also don't use McAfee, its all pure bs that Samsujg promotes, (although I do pay for McAfee for my PCs and Macs)
I also keep Play Protect off, I'm developing an app company wide, and the beta builds aren't signed, causing Google to detect it as a virus