I too have this problem. You advertise on your webpage that the A71 phone comes with Samsung Pay and Knox yet it wont let us download Samsung Pay. Pretty sure that qualifies as false advertisement.
The google play download page for Samsung Pay says it supports the A70 but not the A71.
I tried downloading the APK directly as well but it just gives a connection to server error.
When is this going to be fixed? The phones been out for months and you advertised it with Samsung Pay as a feature.