Pasted from the Server Guide on Pretendo’s Discord server and slightly adjusted.
What is StreetPass Relay?
StreetPass Relay is a feature available on Pretendo Network that allows you to get StreetPass tags from anywhere in the world, with anyone on your Friends List, as long as you have an active Internet connection!
Why can I only tag with my friends?
StreetPass data is not validated well when it is parsed. This can lead to exploits, which is why you are limited to passing with friends. Only friend users that you trust!
Will Relay interfere with my normal StreetPass?
No! Relay was a feature originally intended for use at Nintendo Zones. It has just been enabled for use on all networks, and you will still recieve tags from consoles physically nearby yours.
I haven’t gotten any passes. What can I do to fix it?
You may reset the RTC clock by removing and reinserting your console’s battery, which should reset the task and get you all synced up to the Relay server.
Warning: Removing the battery will reset your console’s Date & Time settings, causing games with time-based activities (such as Tomodachi Life) to penalize you, forcing you to wait 24 hours for the day to tick over.
Can I turn StreetPass Relay off?
At this time, StreetPass Relay may not be disabled. If you do not wish to recieve StreetPass tags, you may deregister titles in System Settings > Data Management > StreetPass Management.
If you remove titles, you will also not recieve normal StreetPass tags for those titles.