Ok. We looked at it and discovered some things.

It was a language pack problem, but that led us down a new road. Does Totara not have an en_us language pack? Our en_us language pack came from our partner, not Totara. The language pack had a mistake that we had to correct.

But, for the course in the orgininal screenshot, the enrollment methods were 1) manual enrollments and 2) learning plan. Manual enrollments had the priority in the list. So can you help me understand why my test user got the error message for the Learning Plan enrollment instead of the Manual Enrollment enrollment?