I keep getting the error message:
Your browser sent an invalid request."
every time that I attempt to view my creative cloud files on my browser. The status of the CC Desktop App is good. I can view my CC file folders and their contents on the desktop versions but not the browser versions.
I have used this extensively in the past without issue.
I tried both Safari and Chrome with the same negative result.
As I understand that you are not being able to use the 'View on Web' option under the assets tab.
We tried doing the same at our end and it worked fine.
Since you have already tried the different browser, try clearing the cookies/cache and then see if it opens. You may also try restarting your machine if possible.
Hope these steps help.