I can understand the issue you're having. Can you please let me know the update after following the steps mentioned below?
- Navigate to WPML > Support > Troubleshooting.
- Scroll down and you'll see a button named "Refresh Translation Services". Click on that button.
- Now, go to "WPML > Translation management" and check the Tilt configuration.
- If all appears fine, then please find and edit the the post in default language that you are trying to submit to the translation service.
- After saving the changes, try to resend the post for Translation to your translation service.
Let me know how it goes. If you require any further assistance, we are always ready to help.