1. Error Message Maker

My family was excited about the Couch Co-op Multiplayer feature of Animal Crossing: New Horizons, but once the game finally downloaded we faced a couple days of frustration and disappointment due to the console announcing 'This user cannot play this software' any time one of my kids attempted to play the game.
After a lot of web searching and poking through forum threads we're finally able to play this game as a family, and I wanted to describe how I fixed it in case other people out there experience the same problem.

If the download is progressing slowly, test your Nintendo Switch console's Internet connection. If you find the download speeds are slower than expected, attempt to resolve any network related issues which may be causing these slow downloads. Animal Crossing. New Style Boutique.

We own two Switch consoles. The first one we got is the Nintendo Switch with Gray Joy-Cons, which belongs to the kids, and the second one is the Nintendo Switch with Neon Blue and Neon Red Joy-Cons, which belongs to me.
I purchased Animal Crossing: New Horizons on my Switch. After a very painful download process (it took three re-tries and some Internet settings tweaks before the game finally downloaded), I was able to play the game just fine. I reached the point where my character became the 'resident representative,' which is an apparent requirement before other users are able to visit your one-and-only island. However, after I quit my game and handed the console to my daughter, when she launched the game and selected her user profile, the switch said 'This user cannot play this software,' and that she would need to purchase a copy at the Nintendo e-Shop. My son had the same results when attempting to play using his profile.

The Cause: My Switch was not my 'Primary Console'

Here are some quick details about our setup, so you can compare against your own situation to see if the solution that worked for me will work for you:

• My copy of New Horizons was a digital purchase (not a cartridge).
• My user profile on that console (the one with red and blue Joy-Cons) is a linked account, with full e-Shop privileges. My kids' profiles on that console are not linked; they're just local accounts.
• Although this was 'my' Switch, it was not the first Switch I had created a linked profile on. When we first bought the other Switch for the kids, I created a profile on that device and linked it to my Nintendo account so I could purchase games for them to play on it. This is important: Since I had already created a linked profile on my kids' Switch, as far as Nintendo was concerned, their Switch was my 'Primary Console.'

So here's what was happening: Even though I was the user who purchased New Horizons, since my Switch was not registered as my primary console, I was the only user allowed to play e-Shop-purchased games on that device. If I had downloaded New Horizons onto my kids' Switch instead, we would all have been able to play the game.

The Solution: Registering my Switch as the Primary Console

In order to make it so we could all play the game on my console I had to de-register my kids' Switch from my Nintendo account, and then register my own Switch as the primary. Here's how I did that:

1. On a web browser I logged into my Nintendo Account.
2. Once logged into the main Nintendo Account page, I clicked the Shop Menu link.
3. On the Shop Menu page, I scrolled down and then clicked Deregister Primary Console.
4. Next, I got onto my Switch, and under my own user profile, I opened the Nintendo eShop app. Nothing obvious happened; I didn't get any message saying, 'This device is now your primary console' or anything. But apparently this was enough, because according to Nintendo, after de-registering from one Switch console, simply launching the eShop on another Switch where you have a linked profile will automatically register that device as the new primary.

As I write this my son's Animal Crossing character is running around and pulling up weeds on my island. I do hope this helps others running into the same issue. It would be nice if the Switch's error messages were more clear about what the real problem was.
Update: I forgot to add when initially writing this that if your Switch frequently says, 'Checking if software can be played' when you launch a title, that's an indication that you are not using your registered primary console. I used to see this all the time when launching my digital downloads, but did not realize it was a hint that something was wrong. Now that my personal Switch is my primary device, my downloaded titles launch instantly.

Animal Crossing: New Horizons is an excellent entry in Nintendo’s long-running social simulator series. But now that the franchise is on Switch, it has some weird quirks in how its ownership rights work that many players will want to know about. Most notably, if you are sharing a digital library across two Switch systems, you can play the game at the same time. But there are a number of significant caveats to keep in mind.

When the Switch Lite launched in September, I wrote about how sharing digital games between Switch systems works. The quick version is that you can play any digital game that belongs to your account on any Switch. But other accounts can only play your digital games on the system you designate as “Primary.” And that still works for Animal Crossing: New Horizons.

I’ve been playing my main save on the Switch Lite. And then my wife’s account can be playing the same digital copy at the same time on the primary original Switch.

But, of course, things then have to get weird.

Animal Crossing: New Horizons knows when you’re trying to cheat the system

As Nintendo has said all along, Animal Crossing: New Horizons locks one island per system. So when I log into Animal Crossing to the original Switch, I am jumping in with a different character onto a different island. And that’s a bit frustrating. I wish I could at least bring my character over from my main save. But that doesn’t work, so how am I supposed to get some of her oranges for my island?

The solution to this problem is maybe obvious to some of you. Why don’t I just open up my wife’s island to visitors and fly my character over a local connection? Ah, yes. Well, I tried that, and this tripped some sort of alarm because I encountered this error message:

Above: An error message telling me to buy another copy of the game.

To summarize, the message is saying that you can only play a digital copy of a game on one system at a time. Now, that’s not accurate. I’ve played the game on both systems simultaneously without issue. But Nintendo is drawing a hard line at permitting you from using one copy to have two people play together from two system on one island …. I know, it’s confusing.

Error Message Maker

This likely applies to online play as well, but that feature isn’t available until a day-one patch.

And while this is frustrating, I also understand Nintendo wanting to put some restrictions on how much a single digital copy can do.