Recently, PDF Expert, Adobe Reader, etc, can not access my University Dropbox account (University of Florida). It throws an error that I have attached. I contacted my University Dropbox admins, they said there is no restriction on my account or they do not have to enable/disable any third-party apps I mentioned earlier. FYI, previously I would use these apps with Dropbox access without no issues. I tried to uninstall and reinstall all these including Dropbox Apps, but did not work. Even though I reset iPad and updated the OS and all software, I still had no luck. Please instruct me how I can resolve this issue. Thank you in advance.