bam The problem is with any loyalty cards available [...]
Maybe so, maybe not. It seems very likely that you are not able to scan any loyalty card that you have tried. But it may be the case that other people have been able to scan one of the loyalty cards that you have tried. If so, presumably that information would be of interest to you.
However, similar to "Cunningham's Law", posting a thread titled "Can't scan Wal-Mart loyalty card" may result in somebody chiming in, as opposed to a generic post like "Google Pay: camera doesn't work".