The longstanding problem where the renaming of a Teams channel did not rename the folder in the SharePoint document library is being fixed. First flagged as an issue in 2016, this is one of the oldest bugs in Teams and it’s taken far too long for Microsoft to squash. The good news is that the fix will deploy in mid-September to close off the problem once and for all.
@Tony Redmond I agree. May 2023 and not fixed. Maybe there's a workaround. Like deleting the synchronized local folder and re-syncing. I haven't tried.
