This is Ahmed Ibrahim from the TP team, and I will help you with this issue.
I have checked the logs you provided and it seems that you have an issue reaching this end-point: hidden link
This is weird because the same endpoint works well with all our clients and I just tested it and it worked.
So I think it could be related to your server, so I need to check it locally on our local server to be able to investigate it properly.
So is it possible to send me a copy from your site? if this is okay for you please use the duplicator plugin: https://wordpress.org/plugins/duplicator/ to create a copy from your site.
:: Duplicator instructions hidden link
Send me both files (you probably want to use DropBox, Google Drive, or similar services)
#Important:
As the snapshot file will be quite big, you can exclude the images if the file is very big, you can use the filters to exclude the uploads file and also use the filter to exclude any compressed files with these extensions .rar, .gz and .zip )
I will set the next reply as a private reply so you can provide a link to download the duplicator package.
The provided sandbox test site is working fine. We can send the jobs successfully to Smartling. Let me know the next step, or should we arrange a call?
Thanks for the update, and it's great to hear that the sandbox works, this means that the issue is related to your installation, it could be some restrictions on the server or a compatibility issue.
So I mentioned some other steps in my previous reply like creating a simple post and sending it, enabling the debug mode, and extracting the debug.log file to give us more info about the exception which will help us to understand the issue and find a proper fix.
It is important that you try these steps and give me the result before we arrange the call so that this will make us more productive.
So please let me know if you can manage to test the rest of the steps that I mentioned in my previous reply, and if you have any doubts please let me know.
We tried creating a simple post as you mentioned and sending it for translation, but we still got the same issue. We are using AWS, and every log we can see in AWS CloudWatch.
The debug.log file will give us the stack trace of the exception so we will know which part exactly is falling and the issue will be clearer to us, without the file, it will be very hard for us to investigate the issue.
We know about the debug.log, but our setup is bit different. We modified the logs to print them from native debug.log file to AWS CloudWatch. Also we are using Docker so we can't go inside the docker container.
So related to the last error, can you please go to WPML -> Support -> Advanced Translation Editor, then click on Error logs, and send me the logs you see?
So about the AWS logs, is it possible to replicate the sending issue again, and check the AWS logs if you find any, please send them to me.
I will set the next reply as private so you can share the data.
It is a different issue, so can you please open another ticket for the ATE issue as it will be hard to focus on two different issues in the same ticket.
I have enabled the private reply for you to share the AWS logs, you can add it to any online drive and share the link with me.
Can you please create a video record while replicating the steps on your site and send the video to me in the next private reply as the WPML dev team needs to check it?