I can't get the spawn to work either. I've entered and reentered maps. I've closed and reopened the game with the spawn as the only thing activated...nothing.
I was able to solve the issue from a comment on Reddit. Can't post links because I'm a new member so here's the comment:
Hope this helps anyone else who had this issue.
I hacked my switch yesterday using a guide I found on Reddit and using Atmosphere as my CFW. I was able to install most of the games I wanted but when I try to install Fire Emblem: Three Houses, I get an error code that says "Invalid NCA (might mean missing sigpatches or a too low firmware)...