Hi,
We got the access, however, I'm not able to log on your backend with it.
Also, debugging involves modifying a file temporarily, testing, changing the modification to another one, testing again, again, and again. So giving you a file to replace each time would require dozens of back and forth between us. That won't be practical for either of us.
If you can't provide a FTP access, would it be possible for you to put in place an extension like extplorer which would allow us to modify the files from the backend of the website ?
extensions.joomla.org/extension/extplorer/