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Hernan IbarraHernan Ibarra 

An outbound message was working well since 2018 and suddenly two weeks ago start given a Invalid Fiel Error?

It was a change in Salesforce that could generate this error??
AbhishekAbhishek (Salesforce Developers) 

Provide more details about your query with a complete error message?

v varaprasadv varaprasad
Hi Heman,

Please test your service with the below website:

Hope this helps you!
If my answer helps resolve your query, please mark it as the 'Best Answer' & upvote it to benefit others.

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