the node whatsapp cant send a message. im noob
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hi gael_adanho welcome to n8n community 
Based from your screenshot, you still using test number. Are you already register you real number on Meta Apps?
If you are using test number then you also need to add target testing number
It says also,
so the phone number you need to add to allow list, test number should be okay atm.
See here too why am i not able to send messages to other number? - Developer Community Forum - Meta for Developers
Hope this helps.