Hello JoeWork
I am one of the representatives from the Online Training troubleshooting team. I have seen cases in which using a different browser can fix this issue, but you may want to try these steps too, most of the time these work:
1. Clear cache/cookies and restart the browser.
2. Try a different browser than the one you are currently using. (i.e. Firefox, Chrome)
3. Try accessing the content from a different network than the one denying the access.
4. Try accessing the content from a different system.
At times we have seen antivirus software or local firewalls block certain processes; please check with your IT dept to make sure that is not the case. Let me know if that worked.