In this case, it is clear, that the Samsung Portable SSD software 1.6.8 is being blocked by OSX Big Sur.
This has been common practice for Apple for quite some time and affects most third part application not installed from the App store. When your MAC, sees an application that is installed but is not trusted by Apple, it will restrict the access or permissions of that third party software. This is commonly done by Apple's security settings. Is that, Apple, especially with the newer version of OSX, tends to block third party software that is not directly from Apple or the App store.
The reason why your Portable SSD T5 is not seen on your MAC, but it is being seen on Android.
