I have experienced the same problem, only in Firefox - it has continued working in Edge.  When I selected "Call history" from my account page, I received the same error message as the original poster.  I solved it (at least for now) by going to Firefox Tools->Options->Cookies & Site Data->Manage Data, entering "cox" to select all cookies with Cox in the name, and then "Remove all shown...".

Yeah, that still works.  I previously posted in this same thread to delete cox.com cookies to fix this issue.  Call History has worked every time I've tried it since then.

Clicking "COX" in the upper left corner of the Webmail Inbox directs you to the My Profile home webpage.  From there, you should be able to access Voice Tools Call history by clicking: My Account > My Account > Call history.  However, it doesn't always work for me and it may not work for you.  Some times after I tried that, I was also unable to access call history from https://phonetools.cox.com/history.

If you get a blank screen, the wrong screen or the "Bad Request" error when trying to access Call history, do the following:

1, Delete "cox.com" cookies

2. Close the browser

3.  https://phonetools.cox.com/history