Did you ever get to the bottom of this, Danijel Todic?
We have the same issue for a couple of our LTIs. I've been through the comments on the issue linked (thank you, Randy). However, what I'm reading seems to suggest that having the mod/lti:manage ability ought to push a user through as a Teacher. Unfortunately, even with that enabled we're still seeing Teacher (non-editing) users come through as Learners.
We have the same issue for a couple of our LTIs. I've been through the comments on the issue linked (thank you, Randy). However, what I'm reading seems to suggest that having the mod/lti:manage ability ought to push a user through as a Teacher. Unfortunately, even with that enabled we're still seeing Teacher (non-editing) users come through as Learners.