XM (yes a live person) told me that any iphone including 1st Gen SE can run/play XM as long as newer then IOS 14.
So I bought a used iphone SE as i want an headphone port. It arrived with a version of 14. but when I went to the App store, it would not allow install of XM unless a IOS 16 version or newer. For kicks/giggles I updated the iphone. The newest it would accept was 15.8.1. After the IOS update, I went back to the App store and lo and behold was able to install XM. I logged in and my Favorites are visible.
Its interesting that the XM web site also says compatibility with IOS 16 or newer.
Thoughts - as in how did I get lucky? And how many more years till my luck runs out with XM and on IOS 15.8.1 device?