That's because it's not currently available here in the UK yet No date has been published for the Beta release If your phone is eligible, you will get a notification on the Members App at some point
And that certain apps won't run correctly on Beta releases; Google Pay etc. Always amazes me each year at folk who jump onto Beta tests then complain that things don't work correctly.
There is a way of getting the European software forced to the phone But quite a few have tried this and have had issues. So this is not recommended way to get it Personally I'd wait for the official version