Failure to Publish Online Link - Error #18

Hi all,

I've been trying for days to solve an issue with publishing online links from INDD files.

Every time the export reaches 100%, I'm presented with a pop-up that states 'An error occured while uploading your document. Please try again. ERROR #18'

I understand that ERROR #18 refers to a failure to connect with the internet network, but I am 100% connected to the internet - it's just that Indesign fails to export the file. The file is not corrupt, and my INDD app is running smoothly otherwise.

I've already tried:

- changing internet networks

- uninstalling INDD

- installing previous versions of INDD and trying to export

- uninstalling/re-installing entire Adobe CC system

- Using the Adobe Clean tool to clean INDD + other CC apps

- checking if the file is corrupt/saving copies of my INDD file to external hardrives

- restarting my laptop

I'm desperate to get this working as it's part of my job, so any help would be greatly recommended. I'm running macOS Monterey 12.1.

Thank you !