Error in Super Mario 3D World, I can’t post messages, I don’t know the reason, I would like to have an answer about what the problem is and if there is a solution. Thank you for your attention.
I don’t think super mario 3d world is currently supported by pretendo.
You can find all the supported games/features here: https://pretendo.network/progress
To access posting messages (and seeing them iirc) in 3D World, become a tester.
More information is available at Donation Subscription FAQ.
Apparently it is public, oops. Are you on SSSL?
https://wiki.erdbeerbaerlp.de/pretendo:game-support-status
Edit: apparently the info on the wiki is wrong, original advice remains true