Hello Franco. Sorry to hear that posting isn't working for you! Do you mind answering a few questions for us? We would like to try and reproduce this problem. Are you signed in using your npub? If so, I recommend signing in with you nsec since we don't support any relay activities (posting, liking, etc.) while only using your npub. If you are signed in using your nsec, does posting work when you restart the app? (close the app, then open it again). Please let us know, thank you.  

  https://video.nostr.build/6b23465a1c0766a7aa2f4d335cff5d55928ce6e527e84c0138c5b598269ceb11.mp4  

 Primal clients work with the set of relays configured in your contact list. To do this, you can go to your network settings inside the Primal App and configure them there. We are planning to add support for the new relay definitions based on NIP-65 soon. 

 I didn’t check relays, I’ve to admit it. ☹️ now I’ve add all I’m using in Primal, let me see if it works. 

 WTH, that was the problem. Sorry buddy, my folk 😩 

 No worries at all! Glad to hear it's working for you now!