When using /teams toggle commands such as /teams off, /teams arena and /teams survival, the mod acknowledges the command as both correct and incorrect.
Example: /teams off
"Flan's Teams Mod disabled"
"off is not a valid teams command. Try /teams help"

This could be due to these being new commands and something was missed out but I'm not sure since I don't use these much.

Forgot to return; Fixed