LTI provider must mention you must choose a unique consumer key when using a shared tool via a launch url

Reproduction steps

1. Enable LTI authentication
2. Enable LTI enrolment
3. Go to a course
4. Select share as LTI page from cog menu or course admin
5. Share a tool

Expected It tells you you must choose a consumer key that is unique
Actual It gives you a secret but it's not clear what the consumer key will be

It's not clear when setting up a shared tool via its launch URL what you should put as the consumer key