"the payload is invalid" - issues with Typeform synchronization

Hi all, I get a “the payload is invalid” error message when synchronizing some translations back to Typeform.

I can synchronize some languages while others I can’t. The original is the same for all. All translations are MT and 95% complete and were done at the same time.

Any ideas?

Did you follow the video step by step?

I see there are few ways to use this integration, but most likely it’s something about language codes.
Here are Crowdin, Typeform may use another

You need to do a language mapping then

Also maybe project is just too big. Try 1 file 1 language synch just to see if it works.