Is your feature request related to a problem? Please describe.

I got stumped as to why my MMU3 /MK3s+ would not change colors when printing. I got the message in octoprint that says
"T1 does not exist" on a popup. I did n't know what to do. Prusa support was stumped also.

Describe the solution you'd like

Add a some text to that message telling them to configure Octoprint like it says in this post:
https://www.reddit.com/r/prusa3d/comments/1bnl0jb/mmu3_with_octoprint/

Describe alternatives you've considered

No response

Additional context

No response