Hi @Romain_Duthoit - Can you post a screenshot of the error message you’re seeing on the API Enrichment step? How many rows are you passing through this step? Can you try filtering down to the one phone number that you know has values?
Just to clarify, our API Enrichment step will unfortunately fail if it comes across a row where the API returns an error. There’s a related feature request in our Community to improve this step to better handle such situations.