oh, i used the zip file from hereMight sound obvious but do you have the files for reiNX on your sd card? The latest version of reiNX is missing files that you need to download by following the official guide (dunno if that's needed for sigpatch though). It also requires 5.1 unlike previous versions of reiNX.
Either way if it is sending payloads to the switch then it's all good
https://github.com/Reisyukaku/ReiNX/releases
i am on 4.1