A greyed-out channel is on your account but Taska can't list to it right now. The label says why:
- disabled: the channel is turned off. Enable it in Channels.
- not authorized: the channel's authorization is incomplete or has lapsed. Reauthorize it in Channels.
- not connected: the channel is no longer installed on your account. Remove it from the plan, or add the channel again in Channels.
A plan can't be saved while a greyed-out channel is selected.
A missing channel is either not on your account, or not one Taska works with. See "Taska overview: what it is and how it works" for the channels Taska works with.
A channel you can't remove was selected by the saved scope you chose. Channels marked "in scope" come from the scope, and channels marked "from defaults" come from your default channels in AI Settings. See "Product scopes in Taska".