Hi Ashleah,
As the scenario explained above, that you are unable to access the site directly through web and desktop app. But its working through the mobile application.
So there might be a possibility that it was an intermittent issue with the website for a while, which was causing trouble connecting to the "Document Cloud" server.
As workaround you may try the following troubleshooting steps to see if that helps-
1- You may check now, if the services are up and running or not. Because this issue is not reproducible at our end.
2- As this is connection issue, so you may check is there is any internet security software acting as barrier. Turn it off for a while and see the difference.
[Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install or activate other software, you should re-enable it as soon as you're done.]
3- When you login on https://cloud.acrobat.com/recent you may check with a different web browser.
4- If this is an office network, then try with the personal one once,
Let us know if non of the solution provided above works.
Regards,
Akanchha