I just point my wallet app at the QR code and it always fails. The only time it worked for me is when I told the cashier I wanted to pay in bitcoin and she knew what to do. This was a few months ago
the QR code that shows up by default (I.e. the one in the photo above) appears to just be a way to pay in fiat from Cash App. I did try to scan that one with a lightning wallet just in case, but it failed as expected.
I just point my wallet app at the QR code and it always fails. The only time it worked for me is when I told the cashier I wanted to pay in bitcoin and she knew what to do. This was a few months ago