Thanks @Amuyea are you able to change the list to include the phones? i just tried using both my IPad mini 2 and iphone SE. both same error, says device not supported.
seems like about half of the x64 devices are not supported judging from all the reported issues here. I can install spotify and other games from here just fine.
btw for those stuck at preflight, this is the same issue, if you exit impactor and re-apply the IPA, at the preflight stage you will get this error and it will show your device ID (e.g. mine in the screenshot is "Iphone8, 4" aka IPhone SE.
you need to re-download impactor 0.9.43, go to Xcode tab, remove certificate, enter your apple ID and successfully remove the "pending cert" stuck in the server before you can try again to apply IPAs using back the latest 0.9.44... but for OPTC u will still get the same error though.