Hi @Bast 

For us to have more info, post screenshots showing how your Zap steps are outlined and configured in EDIT mode so we can see the field mappings and also include any encountered errors.

Here's the capture. 
The problem is related to variables that are not transmitted to Synthflow. The problem occurred this morning.
Thanks for your help

@Bast 

Check your Zap Runs history details to see the DATA IN/OUT for each Zap step to help you troubleshoot: https://zapier.com/app/history/

Issue may be from Zap step 1 not returning those values.

You may need to add a Filter step after Zap step 1: https://zapier.com/apps/filter/help

Values seem to be well transmitted

@Bast 

Most recent screenshots shows the TEST tab within the Zap Editor.

Actual live Zap Run DATA IN/OUT for each step will be found here: https://zapier.com/app/history/

Here are the details. 

@Bast 

Zap step 2 API request logs show the custom variables as populated.

I’d try reaching out to Synthflow Support for help with their Zap app integration and app behavior for troubleshooting.

It would be great to have a solution. I have been trying to contact them for several days about this problem without success.

@Bast 

Most Zap app integrations are created and managed by the app developer using the Zapier Developer Platform, so issues with an app in a Zap step often falls to the app developer to address or help you troubleshoot.

Hello. Do you have any news from Synthflow? Thanks 

@Bast 

To clarify, I do not work for Zapier.

You would need to try reaching out to Synthflow Support on your own.

I was hoping you'd be able to get back to me more quickly. So I'll wait for Synthflow to show up.

Thanks a lot.

Hello. We have the same problem but nobody is answering at Synthflow. I hope they will find a solution.

Is there any news about this problem? Synthlow is still not answering...