Hey Victorial,
We sincerely apologize for the delay in response to your query.
As there was an intermittent issue was going on with the document cloud pdf services which has resultant this error. The problem has now been rectified and the services should now be up and running.
You may please check and let us know if you are still experiencing the same issue?
Related help article- Error Message : "An error occurred while signing in"
Also, If you have tried accessing the service through the desktop application, then you may try it through the web browser once https://cloud.acrobat.com/exportpdf
Regards,
Akanchha