Unabe to use forum on Edge.

moved post to the streaming website area of the forum. 

Old edge issue.  You'll see it in a simple internet searches going back as far as 2016 beta.  Here's one from 2019.

https://answers.microsoft.com/en-us/edge/forum/edge_open-edge_win10/windows-edge-error-400/a262ee90-f89c-4be0-99ed-6021a50dbaa8

Non destructive method is to try the 'repair' function.  'reset' function in edge wipes out history, settings, favorites.....yeah...not particularly helpful.  More helpful than that......is to probably not use edge so much.

It just started today after the weekend forum update. It was good yesterday when under site update. No problem on other sites or xfinity sites. It is just the forum. Since this was moved to the Xfinity stream I should have clarified that.

Try the 'repair' in the link.  It's probably just a cache data corruption.  If that doesn't do it, then do a search for the 400 error and reset -- BUT CAUTION:  Find a procedure from majorgeeks or someone like that to BACKUP and then RESTORE your favorites and settings BEFORE blowing the configuration away by clicking RESET.  I don't have a win 10 box to run through a procedure on currently for a test.

Now it says "page is not working right now , contact site owner". Its the only site I get an error so guess I will use firefox for this sit until it gets worked out if it does., not worth messing things up.

Yeah.  Edge is weird.  It's not like firefox where you can just go into history, remove a visited page to bump it out of cashed history, and reload the page fresh.  I don't want to mess you up without running through a test case first.

I have same issue. The new company who created code is working on it.   I have W10, Edge, fully updated through 3/17/21.