Here are my suggestions for the improvement of Contact List and Detail Views

When you have not created a Channel, yet, it's impossible to Create a contact. That is not a problem per se.

But I assume, that user will get confused and probably think it's a bug. So it would be helpful, if we let them know.

Here are some suggestions I made

1. Add disabled option

2. Replace the input with the note

Disabling the input is the easiest and has the benefit that submitting the form is not possible. But I'd include a link to the channel configuration in the message, which isn't possible inside a select. So a simple note must be used and the submit prevented some other way.

Here's a new mockup of the things I discussed offline with @nilmerg for when there's no channel configured, yet.

To get a feel for how the flow works, I made a little prototype.