Teams - Change Private Channel URL

LexPage23try creating a new channel, then navigate through that channel's tabs (i.e. "Files" or "Wiki"). i was able to resolve a similar scenario caused by an ampersand in a group name effectively breaking the "Files" tab. I changed the URL of the site and eventually had to create a "test" channel, navigate to that channel's files tab, and that fixed the URL for the Files tab of the original channel. I was then able to delete the test channel and everything seemed to work fine.

Drew the conclusion from info in this article (https://learn.microsoft.com/en-us/sharepoint/change-site-address) that said when a site was renamed to go to the Files tab of ANY channel. Since the existing one was broke, I created the test channel to see if that would do the trick and it did.

Hope this helps!