Thanks for reaching out. This happens if the channel name is changed 3 times in last 90 days. You'll need to wait for 90 days to be able to change it once again. Hope this info helps.
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.