This works for me, putting it in Sleep Mode for about an hour.
Edit: Was trying to reply to this post by ChronosNotoshi, not sure why it didn't work:
"As far as I'm aware, that's been an issue that's been occurring off and on for the app in...
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Releases: https://gitlab.com/Sorunome/3ds-streetpass/-/releases
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Yes, translations are planned but still a bit further ahead on the horizon. Soru first wants to make sure that the current functionality is stable and usable.
It means you happened to have gotten a bad time while soru was applying a server...
It's decent, I have to use my phone's mobile hotspot since my Wi-Fi is incompatible (5.2GHz).
Might just be a coincidence then, it worked for the other slots, and there were no issues on my secondary 3DS.
I made an account on this site just for this, since I still take my 3DS nearly everywhere and am saddened by the drop in StreetPasses.
I wanted to report that multiple of my outboxes fail with -28 while uploading, it seems to correspond with the...