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I’ve been dealing with this for over two weeks. The workaround doesn’t work for me. I keep getting this error:
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Hi
Welcome to the Community! 
I have moved your reply to a new post. I hope you don’t mind!
It seems that an event will be considered valid if it only includes parameters consisting of one of the following combinations or a subset thereof:
- City + Country + State + Zip code + Gender + Client user agent
- Date of birth + Client user agent
- First name + Gender
- Last name + Gender
This means that you'll need to complete one of these combinations in the Zap for the Offline Conversion to be sent successfully.
As the validation is done by Facebook, it's likely a data issue. I recommend reviewing the help article provided by Facebook and making sure that sufficient data is available and sent by the Trigger app to create the conversion event. Here's the link to the article: https://developers.facebook.com/docs/marketing-api/conversions-api/best-practices/#req-rec-params
Once you've had a chance to review the article and make any necessary changes, please try running the Zap again and let me know how it goes.
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