Problem Description:
I’m experiencing a consistent error when sending WhatsApp Business Cloud templates through n8n using positional variables.
Here’s a photo of my whatsapp template:
and here is a photo of my node config:
when I set default values (keeping the same amount of variables, I just change values) it works
Information on my n8n setup
@lapiceroazul4 your one input value has a new line character (\n) at the end of the value .
It seems that the WhatsApp API does not like new line characters in template variable., I was also able to replicate this when adding a \n to the end of a variable value.
doing the same from Postman returns the detailed reason for the failure
Hope that solves your issue, if so, please mark this as the solution 
Hi mate, thanks for your reply. As you mentioned, the issue was indeed caused by the use of /n in the city field. However, I’ve recently run into the same problem again, and this time I haven’t been able to find the source of the error.
I’ve already cleaned the /n, tried converting all values into strings, and also removed blank spaces using trim(), but I’m still facing the same issue.
Additionally, I wanted to ask if you could explain how to get the Phone Number ID from Meta. I found this endpoint in the documentation, but I haven’t been able to locate the Phone Number ID to test the request in Postman.
I just kinda feel that the whatsapp node is not that good handling error messages (at least rn), I just decided to make the process using an http request and it works.
It seems that in your failed request posted above a required parameter is missing, this can happen when you have not configured the parameter and value in the node. Or when your flow tries to send an empty string / null value for one of the parameters.
Regarding the phone number ID, you can either get this from the Meta developer portal under WhatsApp → API Setup
or by using this API https://developers.facebook.com/docs/whatsapp/business-management-api/manage-phone-numbers#get-all-phone-numbers
