Write/Send bytes over BLE with Arduino

I'm tryin to make a basic app for sending values over the BLE that I had on my Arduino NICLA .
Im using the "WriteBytes" purple block inside "When Click" because I want to send the values when I press a button.
But it does not do nothing.. My code is okay because I tried to use a BLE app and it worked.

Thats the block for the button
Thanks :slight_smile:

*I tried to add "false" to the "signed" but also didnt work..