Sony chiefs are under pressure to respond to complaints about "cross-play" restrictions imposed on Fortnite.
Gamers have discovered that if they had first played the title on a PlayStation console, they are unable to use the same Fortnite account with the newly released Nintendo Switch edition.
This prevents them from being able to make use of outfits and other in-game purchases and rewards they had accrued.
There is no such limitation when moving between the Xbox One and Switch.
Gamers were already unable to share a Fortnite account between Microsoft and Sony's platforms.
But the appeal of the Switch is that its portable nature allows owners to play when away from home, and so many have bought it as a second games machine.
Sony has yet to confirm it is responsible for the constraint, but it issued the following statement to the BBC.
"We're always open to hearing what the PlayStation community is interested in to enhance their gaming experience," it said.
"With... more than 80 million monthly active users on PlayStation Network, we've built a huge community of gamers who can play together on Fortnite and all online titles.
"We also offer Fortnite cross-play support with PC, Mac, iOS, and Android devices, expanding the opportunity for Fortnite fans on PS4 to play with even more gamers on other platforms."
"We have nothing further to add beyond this at this point," a spokeswoman added.
Both Microsoft and Fortnite publisher Epic Games have previously indicated that the Japanese company had chosen to prevent PlayStation gamers competing against other console owners in the title's multi-player fight-to-the-death Battle Royale mode.
Sony has faced criticism for blocking cross-play in other titles in the past, including Minecraft and Rocket League.
But the sheer scale of Fortnite's success means the backlash has the potential to be more damaging this time round.
Epic said this week that the title has amassed 125 million players worldwide.
And Nintendo has announced that its free-to-play version of the game was downloaded more than two million times in the 24 hours after its release on the Switch on Tuesday.
Complaints about the matter are already threatening to overshadow Sony's publicity efforts at the E3 video games show in Los Angeles.
Each time it posts news about its latest releases to Twitter and Facebook, people have responded by demanding that it allow them to share their Fortnite logins and permit cross-play.
Annoyed @PlayStation for holding my Fortnite account hostage because they don't want to play with others. Pretty sad that I can't use a third party login on the Switch because it's linked to PS4. Pathetic @Sony, pathetic. #BlameSony pic.twitter.com/OfRG55meXr— PKMN Maestro Jerry (@PKMN_Maestro) June 12, 2018
The replies are all people asking Sony about unlocking Fortnite accounts.— Jim Sterling (@JimSterling) June 13, 2018
Since @Sony is apparently blocking #Fortnite cross-play between PS4 and Nintendo Switch, I will be switching to Xbox One as my non-Switch platform of choice so that I can team up and play with my kids. I recommend anyone who can do the same.— Erik Kain (@erikkain) June 12, 2018
The PlayStation 4 is the strongest selling console of this generation by a large margin, but one industry watcher said that this did not make it immune to attack.
"Sony has got to be very careful about how it manages the situation," Samantha Loveridge, associate editor of GamesRadar+ told the BBC.
"Fortnite is absolutely massive and it's only going to get bigger - it's about to come to Android - so Sony has got to start thinking about its closed-garden ecosystem.
"One way or another, gamers deserve an explanation as to why this compatibility issue exists."
Sony does allow compatibility with the PC and iOS versions of the game, indicating that the Xbox/Switch block it is a strategic choice rather than a technical impossibility.
While gamers await comment from the PlayStation firm, its rivals have piled on the pressure.
When asked about the matter, Nintendo's North America chief Reggie Fils-Aime told the IGN news site: "What competitors do is their decision to make. We believe being both developer-forward and fan-forward is in the best interest of the game."
And one of Microsoft's gaming chiefs as well as one of its corporate accounts have also tweeted about the issue.
Nice to see cross play and progression across Nintendo Switch and Xbox. I know many have a Switch. See you in the 🚎!! 👊 https://t.co/mMRXj2GA10— Mike Ybarra (@XboxQwik) June 12, 2018