by jim ko.
Hi jake,
As you were thinking, the cause is due to the field "consumer key" in "show more.." part.
What happened is that this field is hidden by default, but unfortunately it is autofilled by my browser (firefox) with the logged user name ("user" in my case), and so it is saved in configuration when I click on save button.
So I have to remove autofill property in my brower, or I have to expand "show more.." part and clear the field before saving
It's a bit curious that this field appears despite the fact I have configured my external tool in LTI 1.3 ?
Thanks for your fast response.